<span>The correct answer should be C. oil spills. If you take oil into the United States then there's bound to eventually be an oil spill. Habitat loss can occur when you deforest lumber in order to give it to the US because they pay you for it so the animals in your forest lose homes. Air pollution is because of all the fuel used to transport things into the US.</span>
Number 1: The Circulatory System is a vast network that contains organs and vessels.
number 2: Arteries have a thick wall which helps a powerful pressure from the heart.
number 3: Without the Circulatory System the body wouldn't be unable to maintain a internal environment.
number 4: The Circulatory and Respiratory system both have gas to help a or animal live in there internal environment.
number 5: Blood vessels brings oxygen to the tissues and absorbs carbon dioxide and other waste products to clear the lungs. And with out oxygen the tissues won't absorb carbon dioxide to clear out the lungs.
number 6: D
Answer and Explanation
Due to technical problems, I was not able to fill the answer and explanations in the corresponding boxes. You will find them in the attached files.
Answer: D
Explanation:
Many unicellular organisms live in bodies of water and must move around to find food. Most often, they must obtain nutrients by eating other organisms. Plant-like protists, and some types of bacteria, can make their own food through photosynthesis.