Answer:disease preadertism and preadation
Explanation:
because of the sciency stuff
Sickel cell anemia is an inherited disease that is due to a base substitution mutation in a gene.
If there's options, I assume mutation?
If an invasive species is added into a food chain/web, it becomes overpopulated/a pest because it has no natural predators.
It can also disrupt the food chain/web by eating the food supplies of the native organism leading to competitions.
