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:

the correct answer is c   with the systems

flooding wildfire landslides climate change the factors listed have an immediate effect on the animal populations found in any habitat. the four factors would lead to a death. b emigration. eliminate c immigration. d mutations.