Answer:
Living things respond to the environment.
Explanation:
John's body is responding the the cold environment by shivering.
Try letter A that should be correct
Evolution of birth food chain. etc
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.
