Nearly one billion dollars a year are spent on clearing sediment from streams and lakes in the united states. which is the most common source of this sediment? a. productive farmland that is over-irrigated b. waste dumped by mining industries into the waterways c. hilly areas where protective vegetation has been removed

Place the steps tor the formation of the enzyme pepsinogen in correct order

When plants use sunlight to make food, the energy of sunlight is

This is a typical grassland food web. it is also a small picture of an important cycle on earth: the carbon cycle. describe how the carbon gets into this food web. a) bacteria and fungi, the decomposers, recycle carbon from dead organisms. b) carbon is found in the grass and is passed from one level to the next in this food web. eliminate c) all living things give off carbon dioxide as a by-product of respiration and it is released into the atmosphere. d) plants use carbon dioxide as a reactant in photosynthesis, to make usable chemical energy in the form of a sugar.