Answer:
The second line of defence is nonspecific resistance, which kills intruders in a broad manner without focusing on specific individuals: phagocytic cells ingest and kill any germs that enter body tissues.
Explanation:
Mutations are the source of all new alleles. An allele is a variant form of a gene. Variations in alleles lead to variations in organisms. Positive mutations give an organism a better chance of survival. It means that the mutation may be passed on to the offspring. Negative mutations may lead to an early death.<span> Therefore, changes in alleles from one generation to another form the basis of evolution.</span>
By knocking at the bend of the knee with a small "hammer". If the leg "spasms" then the superficial reflex is in working condition. Hope this helps :)
I think its B it sounds more right than the others
