Which compound was abundant in Precambrian Earth's oceans, before complex life evolved on Earth?

A.

dissolved oxygen

B.

dissolved carbon dioxide

C.

dissolved methane

D.

dissolved ammonia

Will everyone's journey be the same, why or why not?

The great-great maternal grandmother of a boy was a carrier for colour-blindness, an X-linked disorder. His great uncle on his mother's side was colourblind but his great uncle's father was unaffected.

Iced tea mix is stirred into water until it dissolves. which statements are true? A. iced tea mix is the solvent B. iced tea mix is the solute C. water is the solvent D. water is the solute

Phosphorylation is another word for glycolysis

What you is the difference between somatic cells and gametes?

Which layers of sedimentary rock at Grand Staircase Escalante National Monument do you think are the oldest?

Animals in the higher trophic levels generally share two characteristics. They are typically

Name two ways that carbon enters the atmosphere

Omid is spending the semester in England where the road signs are in km. If he drives from his school into a town 6mi away, how many km will he drive?

During the light independent reaction of photosynthesis, light energy is converted to the energy currency of ALL cells. This energy-carrying molecule is needed to produce glucose. This molecule is