Notes

1. A.
2.D.
3.D.
4.C.
5.The purpose of the experiment is to see if people who exercise vigorously 15 mins a day or more can solve math problems faster than people who can't. Sample group should be large because the more participants the higher the accuracy. The experimental group consists of people who exercise vigorously 15 mins a day or more, they will continue to do that. The controlled group will consists of people who don't exercise 15 mins or more a day. The data to be collected is how fast people who exercise vigorously 15 mins a day or more can solve a math problem before the people who don't solve it. One way to determine results is to have the people do the same math questions and see which group has the fastest average time.
6.A.
7.A.
8.D.
9.A.
10.C.
11.C.
12.A.
13.C.
14.D.
15. D.
16.B.
17.B.
18.C.
19.A.
20.Plants take carbon dioxide and water, make a carbohydrate glucose which is the basis of all other life: they use it and we steal it from them. After glucose undergoes bio oxydation all that's left of it is carbon dioxide and water, again. Going through anaerobic and aerobic series of enzyme catalysed reactions of creating ATP or adenosine triphosphate which is the immediate source of all energy for any organism we begin with CO2 and H2O and end there, they call it a cycle.