One human impact on the phosphorus cycle occurs through: a. burning of fossil fuels. b. the erosion of agricultural lands. c. the greenhouse effect. d. global warming. e. depletion of the ozone layer.

Identify any four organelles that should be present in the eukaryotic organism and describe the function of each organelle

What is the main reason that attitudes are more often revealed in spoken rather than written language? a. in writing, we try to put the "best face" on what we write. b. we speak far more often than we write. c. in writing, we can more easily conceal our attitudes. d. in spoken language, we are often careless in our use of words.

The smallest parts of these that retain their original properties are called