1) carbon dioxide is returned to the atmosphere primarily by the
a) eruption of volcanoes.
b) respiration of consumers.
c) fallout from solar flares.
d) process of photosynthesis.

Are characterized by dry conditions, limited vegetation and wide temperature range. a.) tropical rain forests b.) deserts c.) grasslands d.) none of the above

An easy way to calculate the amount of energy available at each level is to what?

Many plants can reproduce asexually. which of these is an example of asexual reproduction in a plant? a. pine cones forming on a tree b. cross-pollination in a tomato c. roots sprouting from a potato d. night-blooming jasmine flowers