Hydroxyapatite is the major component of bone that contributes to its hardness.
Answer:
A food web consists of many food chains. A food chain only follows just one path as animals find food. eg: A hawk eats a snake, which has eaten a frog, which has eaten a grasshopper, which has eaten grass. A food web shows the many different paths plants and animals are connected.
Explanation:
If they live in a river, they would most likely need fins (to swim) and gills (to breathe under water)
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