Because mutations can introduce changes in an organism, they can be a source of...
drama
genetic variety
protein synthesis
pollution

Read each description below and determine to which stage of sleep each pertains. then click and drag each box into the appropriate category below.

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.

Why has two different alleles for the same trait?