What is the name for the rocky upper layer of the solid earth?

a. biosphere

b. lithosphere

c. atmosphere

d. magnetosphere

To do this, they needed to acquire a very special internal organelle, called the chloroplast. Where did they acquire this internal organelle? (hint: it's the same place we got our mitochondria)

Drugs that stimulate which neurotransmitter have the potential to treat sexual addiction?

In one or two sentences, summarize the technique of gel electrophoresis.

What are three roundworms that cause diseases in humans how can humans prevent infection from each?

What did people think determined the color of urine?

Which will have a better chance of surviving a major change in the environment where it lives: A) A bacteria strain with only twenty minutes between generations B) A large mammal (like bears) with decades between generations Explain your choice

What are the three-letter "words"of mRNA

What are the two ways that carbon enters into the atmosphere?

If an animal cell is placed in distilled water, it will A) remain the same size. B) shrink. C) swell and eventually explode. D) swell, but stop when the cell wall prevents further expansion.

What atre three types of nerve fibers?