How many years did the precambrain era span

Prokaryotic and eukaryotic cells have many differences but they also share some common features. Which of the following may be found in either type of case?

If a person's blood sugar level becomes unstable what glands might be involved in the problem?

Organisms combine to form what?

The average adult heart pumps about 84./mls of blood at 72 beats per minute. suppose you need to calculate how long it would take the average heart to circulate 3500. ml of blood.

What does it mean when we say a trait is dominant? A: Both parents must contribute alleles for this trait to appear. B. Offspring carry unmatched alleles C. Offspring show this trait even if only one parent contributes the allele. D.

Suppose a bolt of lightning starts a fire in a forest. The fire sweeps through the forest and burns away accumulations of brush and deadwood. What is the most likely effect of the fire on the forest community?

What impact does 2-d diversity have on a company?

How can acid rain affect biodiversity in a pond?

Which of the following would be categorized as a cultural ecosystem service of forests?

Natural selection can lead to formation of a new species which is called?