<span>arteries
are larger, more muscular and more elastic than veins; they carry blood
that is under pressure from having been pumped out of the heart; veins
are under much less pressure, so they are not as strong</span>
Your circulatory system consists of your heart, blood vessels and blood, and is responsible for transporting life-giving oxygen throughout your body. When you exercise, your body's need for oxygen increases; the harder you work out, the more oxygen your body demands.
Answer:
A
Explanation:
(a) It would decrease as blood volume decreases, making it easier for the heart to pump blood.
The independent variable is the new plant food
Answer:
Desert, Plain, Taiga, Tundra, Wetland, Mountain, Mountain range, Cliff, Coast, Littoral zone, Glacier, Polar regions of Earth, Shrubland, Forest, Rainforest, Woodland, Jungle, Moors.
Explanation: