<span>By producing melanin (pigment), the skin protects the underlying structures from ultraviolet light's harmful rays while producing vitamin D, which works with calcium for multiple body processes.
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Vitamin D is produced by the skin when it is exposed to the sunlight. Ultraviolet B (UVB) is the part of the sun's rays that affects the skin to produce such vitamin.
Live only on land. There are many species of underwater plants on Earth. :)
This phenomenon is referred to as receptor situations.
Answer:
Because the snails and elodea carry the elements around the aquarium.
Explanation:
They all grow, need air, have cells, have DNA, and need water and food
