Which is an example of a competitive relationship?

a.
barnacles living on a whale's back feeding on particles in the water

b.
fungus growing around plant roots causing them to grow better

c.
saguaro cactus and sagebrush both needing water in the desert

d.
tapeworm feeding off the nutrients within a human's intestines

the answer is c cumulus. cumulus clouds can be seen on a gray and rainy day, because cumulus clouds create thunderstorms. give me brainliest if right.

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