Which trophic level contains the most amount of biomass in an ecosystem?

Based on the topographic map of mt. st. helens, what is the contour interval of the volcano about height is 2,950 m?

The large increase in atmospheric carbon dioxide in the last 50 years most likely comes from a. an increase in cellular respiration b. increased decomposition by bacteria c. an increase in the burning of fossil fuels d. an increase in photosynthesis

Why do some dna fragments move farther than others during gel electrophoresis? a. because their shapes are different b. because they are different types of molecules c. because the samples are different colors d. because their masses are different