Answer:
1. Vestigial organs.
2. Homologous structures.
3. Analogous structures.
Answer:
A. 20
Explanation:
Truth is its actually 22.5 but including that you can just round it, 20 is the best answer.
Most probably these scientists will do more studies and experiments in order to learn more about the subject. For example, if they compare plastic grocery bag with paper grocery bag it is important to investigate which one is a better resource use in the life cycles, which one is better for manufacturing or whether one of them can be reused. There are many questions about this issue.
