D. One chimp cleaning and grooming the hair of another chimp
Answer: silicon Si, Germanium GE
Explanation:
1A: The legs can be a adjusted, as well as the sand can be swapped out. It’s a very good design for running multiple tests.
1B: He could add books or something under the front or back legs in order to increase/decrease the incline, therefore imitating the hypothesis.
1C: He can change out the sand grains to finer ones, or coarser ones, and record his results of each test.
2: If he sets the model at a steep incline and tests it with coarse sand and fine sand, seeing which one makes a narrower, deeper hole.
Answer:
3NaOH + H3PO4 ---> 3H2O + Na3PO4
Explanation:
The answer would be KMnO4, please let me know if you would like me to explain how i got this