The observed results of an experiment that occur from changes in the independent variable are known as a. controlled variables b. dependent variables c. trials d. constants

Food webs - transferring energy and matter from one level to another. here you see four food webs. one or more are incorrect. which food web(s) show the correct sequence of organisms, from start to top level consumer? a) a b) d c) c d) a and d

Chloroplasts and bacteria are in size. a. similar b. at different ends of the size range c. exactly the same d. none of these

Which of the following was not a major animal on land during the carboniferous period? amphibians insects both a and b none of the above