Which of the following come from types of organisms that lived during only one short period of time and that are used to determine the relative age of rocks? a. imprints b. index fossils c. trace fossils d. extrusions

Which geologic feature would most likely be represented by contour lines john far apart from one another? a cliff a hill a plain a valley

Parasitism could be considered a form of which of these types of relationships? -mutualism -commensalism -predator-prey -mimicry

Biomass can be used to generate electricity. biomass relies heavily on agricultural crops. plants release carbon dioxide and water in combustion. plants use photosynthesis to originally generate the energy that is needed. the chemical energy of these plants all started with what energy source?