Which describes how blood can be protective in nature?

a. by forming a protective layer within blood vessels
b. by carrying cells that defend the body from foreign materials
c. by secreting oil that destroys foreign materials
d. by producing acid that kills foreign materials

B is the answer on ed2020

Explanation:

•there must be variation for the particular trait within a population.

•the variation must be inheritable (that is, it must be capable of being passed on from the parents to their offspring).

•individuals with one version of the trait must produce more offspring than those with a different version of the trait.good

explanation:

emerging idea only occurs as a raw idea that could appear out of nowhere. meanwhile, to reach scientific consensus , that idea must be structured and tested over and over again through various experiments. the scientific consensus transforms the raw idea into idea that is more reliable through the process of scientific elimination.