Which were the earliest oxygen-producing life-forms?

a. cyanobacteria.

b. seaweed.

c. dinosaurs.

d. ferns.

Underlying blood vessels give nails a pinkish appearance. Near the nail root, however, the blood vessels lie deeper in the skin, resulting in a pale crescent, called the:

What is correct sequence of repair as a fracture bone goes through the healing process?

Is the question is it ethical to eat meat testable?

Which has prokaryotic cells? A) Human Blood B), Cows Liver C) Onion Root D) Ecoli

What happens in the electric circuit when the magnet spins?

Which gas is a source of natural groundwater pollution im thinking its carbon

How many atoms of each element are in the chemical formula p2 O5

Organisms that have groups of specialized cells organized into organs are always

What is a cell how does it effect the body

A farmer crossed a yellow maize plant (Yy) with another yellow maize plant (YY). He planted 200 seeds from this cross. How many of the plants would be yellow?