What do you call a person who studies plants and animals?

When a virus invades a host the most common threat is A. production of viral fluids in the bloodstream. B. fermentation of acids in the digestive system. C. destruction of cells by viral reproduction. D. stimulation of muscle tone in the heart.

Crayfish, jellyfish, and shellfish are true fishes. a. True b. False

The chemical found in tears and saliva that hydrolyzes the peptidoglycan in certain bacterial cell walls is

Genes are ___. A - responsible for inherited traits B - units of coded DNA C - located in a specific place on a chromosome D - all of the above

How many chromosomes do parents pass onto their offspring?

The ability of a hormone to affect the activities of a particular cell depends on that cell having specific receptors with which the hormone molecules can bind. The number of receptors present in a target cell is a constant, invariable number.

What do we call dawins explanation for how new species emerge?

Organisms release carbon dioxide back into the atmosphere. What process allows them to do this?

What is considered a pre-existing condition?

Describe a situation in which succession my occur.