Which of the following can be considered fossils?

a. a 1 billion year-old rock.

b. a 1 billion year-old piece of amber.

c. a 1 billion year-old piece of amber with a primitive insect inside.

d. all of the above

How are agents to be tested added to the filter disks Exercises 6-7 and 6-8? A. The disks are held with sterile forceps, dipped into a beaker of the agent to be tested, and then placed on the surface of the plate. B.

Which of the following best describes the role of fructose-2,6-bisphosphate (FBP) in liver cells? a. FBP is a potent allosteric activator of fructose bisphosphatase and an inhibitor of phosphofructokinase b.

Poem about layers of the atmosphere

An enzyme speeds up a chemical reaction in the cell, but can only be used once. a. True b. False

Living organisms come from other living organisms

What is the endocrine portion of the pancreas called?

In which order will seismic waves from an earthquake arrive

Which of the following represents the chemical reaction of hydrazine and hydrogen peroxide to produce nitrogen and water? A. nitrogen + hydrogen peroxide → hydrazine + water B. nitrogen + water → hydrazine + hydrogen peroxide C.

Both frogs and ducks have webbed feet. However ducks are more closely related to perching birds than to frogs. Explain the process that has resulted in both frogs and ducks having feet that are similar

Within the chemical formula 18CO₂ the ₂ is known as a what?