<span>a. Each mitochondria is needed to store a full copy of the male’s chromosomes</span>
This is an experiment where the researcher manipulates one variable, and control/randomizes the rest of the variables. It has a control group, the subjects have been randomly assigned between the groups, and the researcher only tests one effect at a time.
Answer:
1111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111¹1111111111111
Ancient organism remains, fossil layers, similarities among organisms alive today, similarities in DNA and similarities of embryos.