How can pesticide use be harmful to human agriculture? a. the loss of beneficial microfauna can reduce soil productivity. b. pesticides eliminate harmful insect pests. c. pesticides target the elimination of beneficial soil microflora. d. the use of pesticides kills all soil microflora and microfauna.

Environmental differences within ecosystems are generally caused by

Consider the following reaction: 2h2 + o2 —> 2h2o a) what are the reactants in this reaction? b) what are the products in this reaction? c) how many molecules of oxygen are used in this reaction?

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.