The circulatory system works with the ___ system to get nutrients to all body cells. A- endocrine
B- digestive
C- muscular
D- skeletal

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Advances in technology have enabled scientists and researchers to better study the evolutionary relationships between species

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.

This is an active transport mechanism by which cells pump sodium and potassium ions against the concentration gradient