The protective layer of special oxygen molecules in the upper stratosphere that screens out much of the harmful radiation from the sun a- atmosphere b- outer space c- ozone d- biosphere

Select the correct answer. which term do biologists use to describe the average number of individuals of a species per unit area? a. carrying capacity b. population density c. minimal viable population d. survivability curve

Which phrase is the best summary of the model shown? a. the transfer of the sun's energy through trophic levels b. a series of aerobic and anaerobic reactions c. a transformation of light energy into chemical energy d. the breakdown of food molecules

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