Question

Give reasons for the following

1 camels have thick eyelids.
2 the body of a Polar bear is covered with a thick fur.
3 webbed feet are essential for water birds.
4 salmon migrate to long distances.
5 the moist skin of earthworms is essential for their survival

Answer 1

5 All earthworms need a moist environment, as they breath through their skin (they have no lungs) and need moisture for respiration. Earthworms release internal fluids (like perspiration) which trap the dissolved oxygen

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