What stars live the longest?

a. large-mass stars

b. average-mass stars

c. all stars live the same length of time

d. low-mass stars

Where does water come from

It has been proposed that mitochondria and chloroplasts are modern descendants of early prokaryotic cells that began to reside and gradually involved within prumitive cells which statement supports this View

What does it mean to say that two different species of organisms are closely related? A. They have the same preferences in diet. B. They have a common evolutionary ancestor. C. They live in the same habitat. D. They have the same parents.

Describe what occurs during activation of the lac operon.

Where does the eustachian tube lead in a frog?

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.