Biology
Grade-7
Easy
Question
Choose the odd one out.
Hint:
C
The correct answer is:
The American Beaver, the bald eagle and star fish all are keystone species because they eat other species and helps to control their population. They ensure that no individual population grows too large in the food web and everything remains in balance.
Fishes and phytoplankton appear to be keystone food resources for vertebrate predators and scavengers.
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