This is the definition. I hope it helps.
Biological dispersal is the act of movement of individuals from their birth site to a breeding site or from one breeding site to another. It is a phenomenon that contributes to gene flow and affects population genetics and species distribution. Also, it strongly affects population dynamics and induces changes on the ecosystem.
Answer: D. there's no difference
Other statements didn't made sense so that's why It's D.
Hope this helps!!
Brown haired girls with blue eyes isn't usually considered "rare" for a few reasons -
°° Some girl born with, we'll say, blonde hair dyed her hair brown and she had blue eyes. This isn't always rare, because anyone could dye there hair and still have blue eyes
°° Everyone is different - You could have like, red hair and purple eyes, or black hair with yellow eyes. You can pretty much be a person with any hair color and any eye color. Nothing really goes together.
↑ ↑ ↑ Hope this helps! :D