1.

calculate the number of moles present in 9 g of ethane.

Answer»

Solution :In leech, LOCOMOTION takes place by:
(a) Looping or CRAWLING movement: This type of movement is brought about hy the contraction and relaxation of muscles. The two suckers serve for ATTACHMENT during movement on a SUBSTRATUM.
(b) SWIMMING movement: Leeches swim very actively and perform undulating movements in water.


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