Answer:
Hi! Your answer here is D. environmental factor. Being unable to play tennis due to extreme heat is an example of an environmental factor because the natural heat is preventing you from playing tennis. It is not a cost or equipment factor because it has nothing to do with either category. This is also not a personality factor because, though some people may naturally deal better with heat than others, that's influenced more by their location (example: California vs. Maine) than by their personality.
Answer: The answer is 4.1
Try not to go out as much as possible. If you go out, you must wear a mask or other things. When you go home, you must disinfect it. You can use alcohol spray or hand sanitizer.
Answer:
True
Explanation:
Unlike arteries, veins contain valves that ensure blood flows in only one direction. (Arteries don't require valves because pressure from the heart is so strong that blood is only able to flow in one direction.) Valves also help blood travel back to the heart against the force of gravity.
