Answer:
The independent variable is "controlled" or held constant in the control group.
Explanation:
Coral reefs are built by coral polyps as they secrete layers of calcium carbonate beneath their bodies. And inside each coral poly lives single-celled algae called zooxanthellae. So basically in simplistic terms, coral polys create coral reefs and algae is in coral polys which also goes into coral reefs when they are made.
Their fur color is very similar to the color of the bark on the eucalyptus tree.
I am not totally sure but I think it’s B