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A virus is

a free living cell

always parasitic

contains DNA and RNA

cannot reproduce on their own

Describe the role glaciers play in both weathering and erosion.

What does the mitochondrial membrane do

What slime-covered structures are thought by some scientists to be where the first cells might have formed?

Suppose a researcher wants to know whether a high protein diet causes children to learn better in school. half of the children in the study eat a high protein diet while the other half eats their normal diet. the control group consists of the:

A plant evolves a high level of poison that enables it to defend itself against insects. soon an insect that prefers to eat this plant evolves an enzyme that breaks down the poison. this is an example of

Which individual is at the least risk for osteoporosis? thin, elderly male male weight lifter in his 20s petite asian female thin caucasian female in her 40s?

What is the condition of the atmosphere at a particular time and place?

4. What did the mitochondrial DNA testing show? What do scientists believe happened to Anastasia?

What does lucid mean?

Haploid sperm and egg are produced via meiosis. What process is responsible for producing the 2N zygote?