is an abnormal redness of the skin caused by increased blood flow and dilated blood vessels close to the skin's surface.

only about ten percent of the energy at one trophic level is passed on to organisms at the next trophic level. the remainder of the energy is used in life processes or lost as heat.

for a different answer set the answer would be because the oxygen in the water had depleted (apex)

answercells,tissues,organs,organ,system-organism;

levels of biological organization; organism,population,community,ecosystem,biome,biosphere,

hope this .good luck