What are the 2 main groups into which cells are classified? What is the major difference between them?

How many trophic levels are there in the following food chain? phytoplankton - shrimp - perch - pike - osprey

Select the true statements about eubacteria. most live as decomposers and heterotrophs. most only thrive in a narrow range of environments. certain eubacteria are responsible for food poisoning. eubacteria thrive in extreme environments.

Natural resources are any materials that humans obtain from the earth to meet our wants and needs.