Some seeds like soap nuts have very hard shell? Why is it so?

1.	Some seeds like soap nuts have very hard shell? Why is it so?
Answer» 1. Soap nuts will be transported to different places by any means. 2. During the transport, the seed must be intact without any damage. 3. Some birds may swallow it and come out as a dropping on the way of their flight. It is in a very hard shell, the seed is not damaged.

Answer»

1. Soap nuts will be transported to different places by any means.

2. During the transport, the seed must be intact without any damage.

3. Some birds may swallow it and come out as a dropping on the way of their flight. It is in a very hard shell, the seed is not damaged.

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