Answer:
the answer is D) DNA and RNA
They are important in long term memory because they respond faster in a second infection with the same pathogen
It penetrates the skin and can cause mutations.
Answer:
All animals share a common ancestor.
Explanation:
All living organisms including animals have evolved from common ancestral organism. It is evident from various researches in relation evolutionary diversification of species. The process by which numerous variety of species are formed from a common ancestor is known as speciation. The attached diagram showing the phylogeny tree of life is a solid evidence of common ancestral origin of life.