Genetics, double helix, cells
Answer:
DNA codes for RNA which codes for proteins... so A
if i could get brainliest that would be great :)
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.
The Central Nervous system is made out of spinal cords that connect to the brain.