Is an overabundance of nutrients that leads to excessive plant growth and reduction of oxygen in an ecosystem.
denitrification
eutrophication
nitrification
phosphorylation

When it is summer at the south pole, a. the northern hemisphere is tilted toward the sun. b. the southern hemisphere is tilted away from the sun. c. the northern hemisphere is tilted away from the sun. d. both the southern and northern hemispheres are tilted toward the sun.