What gas is changed by some bacteria into a form that plants can use?

A. carbon dioxide

B. nitrogen

C. oxygen

D. water vapor

This is the science of genes, heredity and variation of organisms.

2) A population of animals is permanently split by a natural barrier into two separate populations in different environments. What will likely result after a long period of time? A) The evolution of the two populations will be identical.

What might a scientist analyze?

An organism that produces its food by photosynthesis

How many electrons arein britannium

Size, shape, and position of grains that make up a rock

Which of the following statements cannot be tested by science?

Can you explain how salt from the sea is returned to the land

A species of rabbit is preyed upon by foxes, which are preyed upon by wolves. Humans decide to open a hunting season on the wolf population.

Nearly all nutrients present in tropical rainforest forests are contained in the