In which supereon did single-celled organisms first form on Earth?

a. Cambrian

b. Paleozoic

c. Phanerozoic

d. Precambrian

It is clear that the cause of global warming is most related to levels of carbon dioxide in the atmosphere. True False

Although the Sun is much larger than the Moon, it does not exert as much gravitational pull on the oceans as the Moon. The Moon, although smaller, has more influence on tides. What is the best explanation for this? A.

Darwin called the ability of an organism to survive and reproduce in its enviorment

What are the three common parts of a nucleotide?

1. Your unique genetic identity comes from three different events; crossing over, random alignment, and random fertilization. Explain what each of these are and how they lead to genetic diversity.

What's an example of a multicellular producer

Are microorganisms alive and do microorganisms affect humans

Which statement best describes the process of chemiosmosis and the direct result of its occurrence? A. The choices are Hydrogen ions flow from the thylakoid down a concentration gradient through ATP synthase channels into the stroma.

Describe how human activities threaten polar bears in the arctic

What did Mendel cross pollination of pea plants prove