3. When (what year) were stone tools first used?

What two things do Only plant cells have?

Three types of organisms are listed below. which of these organisms is made up of one or more cells that carry out functions to sustain life? plants humans bacteria

Humans cross plants or animals with desirable traits to create offspring that also have those traits. What is this process called? A adaptation B natural selection C selective breeding

The pKa for the side chain of histidine is 6.0. What is the ratio of the deprotonated imidazole side chain to the protonated side chain at pH 5.0 and at pH 7.5?

How quickly would groundwater flow through Rock with high porosity and high permeability

If you look at the sky and see the Moon as a half-circle, what do you expect should be true about the tides that day? A. The low tides will be much lower than usual. B. The high tides will be much higher than usual. C.

What are the five evidences that a chemical change has taken place?

In frogs muscle tissue is usually grouped into large

after the brain receives information from the body's sensory receptors, what is the next step in responding to this information?

What does the endosymbiont theory explain about the origins of plant and animal cell