Which of the following come from types of organisms that lived during

only one short period of time and that are used to determine the

relative age of rocks?

a. imprints

b. index fossils

c. trace fossils

d. extrusions

Is there only one mid ocean ridge

Which of the choices below does not support the theory of endosymbiosis

If the grass is green why is the sun hot?

Contrast the life cycle of the plant zea mays with the animal c. elegans.

Which of these is a scientific way of gathering information? a. relying on religious explanations b. collecting stories c. collecting data d. relying on strong emotions

Uit flies are commonly used in genetic investigations that focus on traits passed from parents to offspring over several generations. What can you infer is the reason fruit flies are the most commonly used organism for this type of investigation?

5 potential causes of Microevolution

Delia is interested in finding ways to cure diseases. Which of the following career fields would best suit Delia's interest? animal biology cytology nuclear biology zoology

The purpose of a mordant in the Gram stain is to: make gram-negative cells visible. prevent the crystal violet from leaving the cells. make the flagella visible. make the bacterial cells larger. remove the simple stain.

Nicolas Steno (1638-1686) recognized that fossilized shark teeth were formed from actual prehistoric shark teeth.