PLEASE HELPHow does DNA compact itself in order to make chromosomes? and What role do certain DNA genes play in mental disorders?

answer; the correct answer is desert plants;

1. desertification

2. captive breeding

3. black rhinoceros

4. renewable resources

explanation:

mark brainliest!

i am going to guess that it is co2.

the principles and empirical processes of discovery and demonstration considered characteristic of or necessary for scientific investigation, generally involving the observation of phenomena, the formulation of a hypothesis concerning the phenomena, experimentation to test the hypothesis, and development of a conclusion that confirms, rejects, or modifies the hypothesis.