To what extent has the presence of a true coelom in animals changed over the course of evolution?
the presence or absence of a true coelom appears not to have changed during the course of evolution.
the presence or absence of a true coelom appears to have changed exactly once during the course of evolution.
it is impossible to tell whether the presence or absence of a true coelom has changed during the course of evolution.
the presence or absence of a true coelom appears to have changed multiple times during the course of evolution.

Option D is the correct answer.

To what extent has the presence of a true coelom in animals changed over the course of evolution?  

A coelom is a body cavity that is formed from the mesoderm tissue.

Option D - The presence or absence of a true coelom appears to have changed multiple times during the course of evolution.

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producers: apple trees, potatoes, carrots, grains, acorns, cabbage, grass, corn, lettuce

consumers: deer, mice, rabbits, chickens, squirrels, horses, worms, cows

predators: eagles, frogs, wolves, owls