Two different species of frogs mate successfully and produce fertile hybrid offspring. however, the offspring of the hybrids do not develop completely to adulthood. this is an example of which type of reproductive barrier?

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.

What are the three groups of atoms that make up amino acids called