Answer:
This happened because the check points in cell cycles are not working properly which can help to stop cells having abnormal chromosomes.
See the attachment for proper understanding what actually happened in cell cycle check points.
Well all your doing is writing a paragraph about variation and pressures that can change the characteristics of population along with an example
Answer:
Cohesion: Water is attracted to water, and Adhesion: Water is attracted to other substances.
Probably B
Observation is using your senses to collect information. Empirical data and investigation are related to observation.