A series of choices between two characteristics that is used to identify organisms is called a

A. characteristic chart.

B. characteristic key.

C. dichotomous chart.

D. dichotomous key.

Why does Earth contain such diverse life forms?

Why do plant cells have both chloroplasts and mitochondria?

Respiratory acidosis results when lungs are obstructed and gas exchange is inefficient. respiratory acidosis results when lungs are obstructed and gas exchange is inefficient. a. True b. False

Explain reproductive phase of life in women

Squirrels will make alarm sounds when a model of an owl is placed in their territory. When a red block the same size of the owl is placed in the territory, the squirrel does not alarm. What can you conclude from these observations?

The two major pathways by which molecular nitrogen is converted into forms more useful to living organisms are

What does low white blood cell count and low neutrophils mean?

A. Many parts of the brain appear to have no useful function in today's world. b. Losses of small areas of certain parts of the brain rarely cause devastating, often permanent, losses of function. c.

Which of the following states was not a member of the Confederacy?

A sand bar that completely crosses a bay, sealing it off from the open ocean, is called what