According to the food pyramid which level has the greatest amount of energy?

a. primary consumers

b. primary producers

c. secondary consumers

d. tertiary consumers

How many human threat are there to a population?

A valid hypothesis must be testable. a. True b. False

Who discovered the ABO human blood groups?

Which term refers to the thick folds of tissue found on each of the cerebral hemispheres?

Compounds that do not contain carbon (with hydrogen are called ___compounds

Finish this sentence: most new species arise from a common ancestor one ... A) mutations randomly occur. B) populations of the original species suddenly become isolated from each other. C) natural selection does not occur.

which kind of tissue is designed to regulate temperature, secrete lubricants and protect the body from harmful substances

Which of the following examples can cause gene flow between populations?

Predict: logging removes vegetation that anchors soil and prevents erosion. how do you think logging will affect a coral reef? explain.

Describe how an amoeba feeds