Natural selection is differential reproduction among individuals in a due to differences in , which are said to be adaptive. Individuals with the adaptive have a reproductive advantage (increased reproductive fitness); therefore, they contribute a disproportionately high number of progeny to the next . The adaptive and the underlying will increase in frequency in the over time. a. mutation
b. reproduction
c. population
d. generation
e. genotype
f. phenotypes
g. phenotype

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.