Explain why the muscular system cannot act alone to perform a skill such as rock climbing. Describe what other systems must be a part of this rock climber's game plan.

It has to act together with the nervous system.

Explanation:

The muscular system executes the actions that are coordinated and given by the nervous system, without this neuromuscular set manufactured by the motor plate, the muscle would even be hypotonic and atrophied in addition to not being able to execute the action of climbing.

the answer is:

carbon dioxide

"do a testcross with a homozygous recessive plant."