Answer:
a
a process that selects variations to help with survi al and that spreads the variation to more offspring
Explanation:
the weak don't survive the strong thrive
Answer:
Heterotrophs
Explanation:
Autotrophs are organisms that are able to use a source of energy such as sunlight, to produce their own food. Heterotrophs cannot produce their own food and must rely on the foods they ingest for energy.
I would say extreme temperatures.
This will occur if both genes from both parents are the x-linked recessive gene. this is due to the fact if the child had a dominant gene it would hide the recessive gene.
