The wings of auks (alcidae), used for swimming, are called an exaptation because:

A. in the ancestor, wings were used for flight, but they also function well in water.
B. individuals that do not use their wings for swimming have lower fitness.
C. female auks are more attracted to swimming males than flying males.
D. they are useful, but don’t affect fitness. they have a de novo form that was not present in ancestors.

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.