Leafs do photosythesis because leafs absorb blue and red light and reflect green just an aditional fact for ya
The answer is the gigantism. A gigantism is a condition in
which the growth hormone of an individual will likely be in excess than of its
normal range and the reason for that is because of the pituitary tumor cells as
they secrete the GH.
The nervous system, i could be wrong.
Random changes in allele frequency in a population are usually called genetic drift. The reason why this is the answer is because it is a very specific word which is used to describe exactly that - random changes in allele frequency.
All the other cases; answers, here aren't correct and don't apply.
Normal sex cells will have 23 chromosomes