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it is either (chiefly with reference to people) sexual activity, including specifically sexual intercourse.or else either of the two main categories (male and female) into which humans and most other living things are divided on the basis of their reproductive functions.

the state of being male or female.

(1) simple diffusion

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Also known as gender. It is a term used for the state of being male or female (typically used with reference to social and cultural differences rather than biological ones)

to prevent the back flow of blood

The main function of thevalvesinveinsis to prevent back flow of blood.

Explanation:It is the veins further away from the heart in the lower limbs that have valves. This is to ensure that blood only flows in one direction ie back to the heart. This system of valves is need to overcome the effect of gravity working against the upward flow of venous blood.

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To prevent the back flow of blood veins are provided valves.

Whenthe pulmonaryvalve ismissing or does not work well, blood does not flow efficiently to the lungs to get enough oxygen. Otherheart defects that can occur withabsentpulmonary valveinclude: Abnormal tricuspidvalve.

Aheart valvenormally allows blood to flow in only one direction through theheart. The fourvalvescommonly represented in a mammalianheartdetermine the pathway of blood flow through theheart.

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Pulmonary artery:Transportdeoxygenated blood from heart to lungs.

Cardiopulmonary resuscitation is an emergency procedure that combines chest compressions often with artificial ventilation in an effort to manually preserve intact brain function until further measures are taken to restore spontaneous blood circulation and breathing in a person who is in cardiac arrest

Chromosomalsex is determinedat the time of fertilization; a chromosome from the sperm cell, either X or Y, fuses with the X chromosome in the egg cell. Gonadalsexrefers to the gonads, that is the testis or ovaries, depending on which genes are expressed.

Thepulmonary valve(sometimes referred to as the pulmonicvalve) is the semilunarvalveof the heart that lies between the right ventricle and the pulmonary arteryand has three cusps

The chief difference betweenarteriesandveinsis the job that they do.Arteriescarry oxygenated blood away from the heart to the body, andveinscarry oxygen-poor blood back from the body to the heart

arteries have thick and muscular walls while veins have thin and less muscular wallsarteries walls are elastic while veins walls are non elastic

Veins:-carry blood from the tissues of the body back to the heart-are usually positioned closer beneath the surface of the skin-are less muscular than arteries, but contain valves to help keep blood flowing in the right direction, usually toward the heart-would collapse if blood flow stops.

Arteries:-carry blood away from the heart to the tissues of the body-are usually positioned deeper within the body-are more muscular than veins, which helps in transporting blood that is full of oxygen efficiently to the tissues-would generally remain open if blood flow stopped, due to their thick muscular layer.

The inferior and superior vena cava bring oxygen-poor blood from the body into the right atrium. The pulmonary artery channels oxygen-poor blood from the right ventricle into the lungs, where oxygen enters the bloodstream. The pulmonary veins bring oxygen-rich blood to the left atrium.

13. option B is the answer.

14. true

15. option A foramen ovale

The plants gradually lose their vigour as there is no genetic variation. They are more prone to diseases that are specific to the species. This can result in the destruction of an entire crop.

Since many plants are produced, it results in overcrowding and lack ofnutrients. loading.

Chromosomalsexisdeterminedat the time of fertilization; a chromosome from the sperm cell, either X or Y, fuses with the X chromosome in the egg cell. Gonadalsex refers to the gonads, that is the testis or ovaries, depending on which genes are expressed.

Oxygenated blood is first formed in the lungs which is transported to the heart through the pulmonary vein. It enters through the left atria and passes into the left ventricle. From the left ventricle it passes through Aorta and goes to all body parts and becomes deoxygenated which is again purified in the lungs after passing through the heart.

pulmonary vein is the answer.

Thepulmonary veinsare the veins that transfer oxygenated blood from the lungs to the heart. The largestpulmonary veinsare the four mainpulmonary veins, two from each lung that drain into the left atrium of the heart.

Theleftside of the heart receives oxygenated blood from the pulmonary vein and pumps it into the aorta, while therightside of the heart receives deoxygenated blood from the vena cava and pumps it into the pulmonary vein.

The left side pumpsoxygenated blood(high inoxygenand low in carbon dioxide) to theorgansof the body.Deoxygenated bloodenters the right atrium from the vena cava. The pulmonary arterycarries deoxygenated bloodto the lungs. ...Bloodis pumped into the aorta, whichcarries oxygenated bloodaround the body.

the left side of contains oxygenated blood and right side of the contains deoxygenated

ph of oxygenated bloodis fill in the blanks

Ans :- Visiting Friends and Relatives"(VFR tourism / VFR travel) is a substantial form of travel worldwide. Scholarly interest into VFR travel developed in the mid 1990s after Jackson’s (1990) seminal article suggested that this type of tourism was much larger than official estimates suggested.Most official data collections differentiate travel as being for either leisure, business, or VFR purposes. In many destinations, VFR is the largest or second-largest form of travel by size. Definitions have been traditionally lacking due to the complexities involved in understanding VFR travel. VFR travellers can state a VFR purpose of visit but that does not necessarily mean that they are staying with those friends / relatives. Similarly, they may be accommodated by friends / relatives although have a different purpose of visit.

Veins is the best answer

The heart recieves its own blood supply through the (veins).

Cardiac output is the volume ofbloodbeingpumpedby the heart in a minute. It is equal to the heart rate multiplied by the stroke volume. So if there are 70 beatsperminute, and 70ml bloodis ejected witheachbeat of the heart, the cardiac output is 4900ml/ minute

Inferior vena cavais the blood vessel that brings deoxygenated blood from the lower part of our body to the heart.

Blood performs the following important functions:(i) Respiratory function: Blood transports oxygen from the lungs to body organs and CO2 from body organs to lungs.(ii) Transport of food: Blood carries digested food to different cells of the body.(iii) Transport of hormones: Hormones are transferred from their place of secretion to their place of action through blood.(iv) Thermoregulation: Blood also maintains proper body temperature.(v) Regulation of water and balance of acid and base: Blood brings about the balance of acid, base and regulates water contents of the body.(vi) Removal of metabolic wastes: Blood carries various metabolic wastes to kidney, skin and intestines for excretion.(vii) Besides the above functions blood also protects our body against micro-organisms.(viii) Blood also helps in the formation of a clot in the event of an injury to prevent further loss of blood.

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Cytoplasmicorganelles which help in the manufacture of starch.

option D myelin sheath Schwann cell produce myelin sheath.

Gelatinous sheathis a covering found, generally around the cells in colonies of cyanobacteria. It holds the cells in colonies together.

what is its difference between mucilagenous sheath

The endodermisofa dicot stem is also calledstarch sheathThe cells ofthe endodermisina dicot stemare rich in starch grains, and hence, it iscalled astarch sheath.

Sex chromosomesin sperms determine the baby’s gender. Humans have 23 pairs of chromosomes in each cell. A pair of chromosome forms the sex chromosomes. Males carry XY and females carry XX chromosomes. Reproductive cells give rise to gametes by the division of meiosis. A gamete is a mature reproductive cell - a sperm or an ovum.If a sperm carrying X fertilises the ovum with X chromosome, then the resulting baby is a girl.If a sperm carrying Y chromosome fertilises the ovum with X chromosome, then the resulting baby is a boy.Hence males are responsible for the gender of the newly formed babies.

a) complex tissue xylem and phloemb) comumnar epitheliumc) cuboidal epitheliumd) smooth musclese) cardiac muscles f) smooth muscles

..vascular bundle = consist 2 type of tissue : xylem, phloem

Xylem for transport of water

Phloem for transport of food

...Inner lining of intestine = epithelial tissue

...Lining of kidney = cuboidal epithelial tissue

...Skin = stratified squamous epithelial tissue

...Muscle of heart = myocardial muscle tissue

It can be epidermal tissues

These cells are joined together in tissues that may be eitherstriatedor smooth, depending on the presence or absence, respectively, of organized, regularly repeated arrangements of myofibrillar contractile proteins called myofilaments.Striatedmuscle is further classified as eitherskeletalorcardiacmuscle.

option c is the answer.

Muscle tissueis asoft tissuethat composesmusclesin animal bodies, and gives rise to muscles' ability to contract. This is opposed to other components or tissues in muscle such astendonsorperimysium. It is formed duringembryonic developmentthrough a process known asmyogenesisMuscle tissue varies with function and location in the body. In mammals the three types are:skeletal or striated muscle;smoothor non-striated muscle; andcardiac muscle, which is sometimes known as semi-striated

Structure of Muscle

Amuscleconsists of manymuscle tissuesbundled together and surrounded by epimysium, a tough connectivetissuesimilar to cartilage. The epimysium surrounds bundles of nerve cells that run in long fibers, called fascicles. ... This layer allows nerves and blood to flow to the individual fibers.

Green beetles are more because when all gree,red,blue beetles together animals can only see red and blue whereas green canot be seen because they are green in colour so does the grass so the organism can see blue and red and eat them so the no. of red and blue are less and green more.

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1)Yeastare single-celled microorganisms that are classified, along with molds and mushrooms, as members of the Kingdom Fungi.Yeastsare evolutionally diverse and are therefore classified into two separate phyla, Ascomycota or sac fungi and Basidiomycota or higher fungi, that togetherformthe subkingdom Dikarya

2)Shrubs are much taller than herbs which might be of our height. Shrub is a medium-sized plant with bushy, hard stems with branches. Although stems are hard, they are flexible but not fragile. Rose, lemon, andhennaare some of the common shrubs around us

Nostocis a diverse genus of cyanobacteria. ...Nostoc, first discovered in the 19th century, is one of the most widespread phototrophicbacteriain the world. As a nitrogen fixer, thesebacteriamay provide plants with important nutrients and therefore can be used agriculturally

An amoeba, often called amoeboid, is a type of cell or organism which has the ability to alter its shape, primarily by extending and retracting pseudopods. Amoebas do not form a single taxonomic group; instead, they are found in every major lineage of eukaryotic organisms.

Leech is an ectoparasite on cattle which isSanguinivorous

Asnailuses its single long,muscular footto crawl on a layer of mucus-like slime that it secretes. ... These waves ofmusclecontraction and relaxation travel along the central portion of thefootfrom tail to head. The wavesmovemuch faster than thesnailitself, and generate enough force to push thesnailforward.

mules isanswer thes

Mules are the organisms who do not reproduce

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mules are do not reproduce.....

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mule can't reproduce as they are sterile

mules are the organisms that have lost the ability to reproduce

meules because cat ,rat, cow all do sexual reproduction soo itS meules that do not reproduce ....😊

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acquired immune deficiency syndrome

acquired immune deficiency syndrome

Drinking water, also known as potable water, is water that is safe to drink or to use for food preparation. The amount of drinking water required varies. It depends on physical activity, age, health issues, and environmental conditions.