What do all ecosystems have?

a. biotic parts only

b. abiotic parts only

c. producers only

d. biotic and abiotic parts

Consider two cells: a stomach-lining epithelial cell dividing more than twice a day and a liver cell dividing every year or two. Which cell is likely to be in G0 phase and why?

How does natural selection produce changes in populations and not individuals?

Imagine that certain laws of physics could be ignored and you were able to travel vast distances in moments. Now imagine that you traveled to an Earth-like planet located light-years away that is known to support life.

Identify one important effect of the rise in the level of green house gases

All BUT ONE is a reason why environmentalists question biofuels as sustainable energy resources. A) The production of certain biofuels consumes more water than any type of fuel energy.

What part of the brain triggers a head movement in response to a loud sound in the environment?

Which of these elements is found in both carbohydrates and water? carbon oxygen nitrogen helium

Why do you suppose the intestine is so long compared to the rest of the digestive tract?

Vertebrates that are warm blooded, give live birth to live young, and nourish their young with milk would be classified as A) amphibians. B) bird. C) mammals. D) reptile.

What did the experiments of Hershey and Chase show? Bacteriophages pass from parent to offspring. Viruses pass from parent to offspring. DNA passes from parent to offspring. Protein passes from parent to offspring.