In order to improve the condition of your muscular system, you could participate in aerobic activity at least .A.3 minutes 5 times a weekB.10 minutes 4 times a weekC.30 minutes 3 times a weekD.50 minutes 3 times a week

a and c are the answeres

kelp are large brown algae that live in cool, relatively shallow waters close to the shore. they grow in dense groupings much like a forest on land. these underwater towers of kelp provide food and shelter for thousands of fish, invertebrates, and marine mammal species.

e) all of the above