Question

15. The ultimate source of genetic variation within a population describes what characteristic of living things. 16. What is a hypothesis? 17. In an experiment, what is the variable being tested called? 18. If given an experimental scenario, be able to identify experimental and control groups. 19. In the experimental evaluation of a new drug, a placebo serves what purpose? 20. Explain the importance of information transfer in living systems, and include three specific examples. 21. Identify two adaptations in different living organisms and use natural selection to explain how each may have logically evolved.

Answer 1

The ultimate source of genetic variation within the population is genetic variation.
It describes that living things are undergoing evolution.

The hypothesis is possible and made an explanation for explaining a certain phenomenon.
It is just an idea and is constructed before the experiments on it have conducted.

The dependent variable is tested during an experiment.

Control group is the one which does not receive any change in the independent variable of the test.
The experimental group is the one in which an independent variable is changed and tested.