The earth moves closer to the sun and we get summer. then when the earth moves further from the sun, we get winter.
Answer: Vena cava also know as (SVC).
Explanation: Blood provides oxygen and nutrients to the body and removes carbon dioxide and wastes. Oxygen-poor blood returns from the body to the heart through the superior vena cava also know as (SVC) and also inferior vena cava (IVC), these are the two main veins that bring blood back to the heart.
Competition requires instant succession within organism but parasitism can still be a gradual process due to its types exo and endo
THE ANSWER IS COMPETITION
Answer:
Bacteria :) Please follow me if my answer helped
Explanation:
