The four laws or principles that are involved with the study of Stratigraphy are the following:
1. Principle of original horizontality
2. Law of superposition
3. Law of crosscutting relationships
4. Principle of Lateral Continuity
5. Principle of Faunal Succession
6. The Law of inclusions
Therefore, the correct answers would be 1, 2 and 4. Hope this answer helps.
B is better because it has more surface area.
Genetic variation is advantageous because it enables some individuals and, therefore, a population, to survive despite a changing environment.
They have more little impact because they are renewable