Atmospheric oxygen increased after the evolution of photosynthetic prokaryotes.

The capsid of a virus is the a. protective outer coat. c. nucleus. b. cell membrane. d. cell wall and membrane complex.

Consider the following prediction. Prediction: If cows need to eat protein to build muscle tissue, then an increase in the amount of protein in a cow's diet will result in an increase in the average weight of a cow over a two-year period.

Goes to the kidneys to extract water from the excretory system and put it back into the

How do clastic sedimentary rocks form? A. Fragments of rock are squeezed and cemented together. B. Plant and animal remains are squeezed and cemented together. C. Solid chemicals in water harden and form rocks. D. Lava cools and hardens into rock.

How do bacteria maintain their internal ph despite the ph of the environment in which they grow?

Freud believe that certain troubling symptoms could be traced to painful unconscious memories. This led him to suspect that these symptoms resulted from

Reducing the volume of a gasits pressure if the temperature of the gas and the number of particles are constant.

Salt deposits form on a car in the winter. Over time, the salt covers more of the car. Is the salt alive? a. Yes, salt deposits are alive because they maintain their structure. b. No, salt deposits are not alive because they do not reproduce. c.

Belinda recently completed a treatment program for breast cancer. For the last year, she took a drug treatment that worked to interfere with rapid cell division; what type of cancer treatment did Belinda undergo?

What do scientists call the theory that the universe will shrink in the future?