The respiratory system contains which of the following structures and organs? A. blood, blood vessels, heart B. tonsils, thymus, spleen, red bone marrow C. lymph nodes, lymph vessels D. lungs, respiratory passages, diaphragm

What type of heterotroph is a fish?

What happens if the environment changes and a population in that environment has developed no new adaptations?

How does the location of DNA in animal cells compare to DNA's location in plant cells? A. Animal cells have DNA in their nuclei and mitochondria, while plant cells have it in their nuclei, mitochondria, and chloroplasts. B.

Plant-like protists are considered to be a. chemotrophs b. heterotrophs c. autotrophs d. none of these

A group of molecular biologists is trying to synthesize a new artificial compound to mimic the effects of a known hormone that influences sexual behavior. They have turned to you for advice.

If rabbits gave birth to two young every two years, like bears, what would happen?

Genes are located on what and each gene controls a specific what

Refer to the introductory section of the chapter entitled "Earthbound Extraterrestrial? Or Just Another Microbe in the Mud?" Which of the following statements would be a feasiblehypothesis? A. If microbes do not have phosphorus, they will die. B.

Processes and packages proteins and lipids in the cell

The largest reservoir of nitrogen is found in which of the following? A. earthworms B. marine organisms C. atmosphere D. trees