Why is it important for blood to flow in only one direction?

answer: i cant find your answer. do u have another way i can answer it for you : )

explanation:

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