Answer:
Water
Explanation:
The main things living things need to survive are food, air, sunlight and water. You have to stay hydrated for your body to continue functioning
Those two are the muscular system and the excretory system because you use your muscles to push up and down and your excretory system produces the sweat you use while doing them
I think the answer is A. it doesn't make sense
The answer to your first question is D. Three months. The reason why is it takes at least 3 months to have detectible HIV antibodies. In rare cases, it may take up to 6-12 months.
The second question I'm not 100% positive on but I believe the answer would be B.
