Which structure prevents backflow of blood to the right ventricles?

Here are the answers to all the questions:

SECTION I: QUESTIONS 1-7

• Question 1: The site in the female reproductive system where fertilization occurs is the oviduct. The final answer is $\boxed{\text{C}}$

• Question 2: In the given ecosystem, the locust is the primary consumer as it feeds on producers like cabbage. The final answer is $\boxed{\text{A}}$

• Question 3: When the body is dehydrated, ADH (Antidiuretic Hormone) is secreted to increase water reabsorption in the kidneys, bringing the body back to normal. The final answer is $\boxed{\text{D}}$

• Question 4: A group of