Although the operation of natural selection requires that genotypes differ in fitness, for some geneticists it seems easier to understand natural selection than fitness. Partly this reflects the fact that the word “fitness” has been used to mean subtly different things. Here I distinguish among these meanings (e.g., individual versus absolute versus relative fitness) and explain how evolutionary geneticists use fitness to predict changes in the genetic composition
Answer:Cell contains mitochondria which is known as power of the cell as it synthesises ATP ( energy currency of the cell ). cell already contain sufficient amount of ATP so if supply ATP externally cell will burst.
Because the race doesn’t really have a defined meaning it’s more of a social thing to mean where are you come from and it’s really used to divide people who genetically aren’t divided??
It would be support and movement of the skeleton
