1.
what is biodiversity?
the number of mammals that live in an area
all of the species that live on the earth
all of the phyla that live on the earth
the entire gene pool

The Correct answer is

All of the species that live on the earth .

Explanation:

Biodiversity is the variation of lifeforms within the given ecosystem on the entire Earth.The Biodiversity we found on the earth today are the millions of different and distinct species we found today on the earth and it is the outsourcing of four billion year of evolution.Biodiversity can also be used to measure the health of the biological system. and also help the scientist in their research.

The answer is 3. -1/2 n + 1 1/2 n add the coefficients to get 1n or just n. then n-n is 0 what is left is 3.