Its skin so it protects the internal organs and systems
The smallest level would be cell, then tissue, then organ, then organ system, then the largest level, which is organism, since there the most complex.
Answer:
Increase in frequency.
Explanation:
The theory of natural selection states that genetic variations are present in the natural populations. Some organisms have one or more genetic variations which in turn increase their chances of survival and enable them to reproduce more. These organisms leave more progeny. It results in an increase in the frequency of those beneficial genetic variations in the population over the generations. This is how natural selection favors adaptive genetic traits and increase their frequency in the populations.
The correct answer would be: B. I hope this helped!