Aresearcher discovers two populations of birds that are similar. the two populations live in habitats that are different. what evidence might suggest to the researcher that the birds belong to different species rather than the same species?

a: some birds appear to be hybrids of the birds in the two populations.
b: the birds in the two populations have different mating behaviors.
c: birds in the two populations sometimes feed in different locations.
d: the two populations of birds feed at different times of the day.

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.