Which of the following happens during conditions of eutrophication in a river?
a. oil spills lead to an excess of dissolved oxygen
b. fertilizers poison aquatic plants that require different nutrients from land plants
c. fertilizers from farm runoff chemically react with dissolved oxygen, making the water acidic and killing fish
d. nutrients from fertilizers cause thick mats of algae to grow, eventually leading to a
loss of dissolved oxygen

An  atom  (ours, not carroll's) consists of a positively charged  nucleus, surrounded by one or more negatively charged particles called  electrons. the positive charges equal the negative charges, so the atom has no overall charge; it is electrically neutral. most of an atom's mass is in its nucleus; the mass of an electron is only 1/1836 the mass of the lightest nucleus, that of hydrogen. although the nucleus is heavy, it is quite small compared with the overall size of an atom. the radius of a typical atom is around 0.1 to 0.25 nanometres (nm), whereas the radius of a nucleus is about 10-6  nm.  *  if an atom were enlarged to the size of the earth, its nucleus would be only 200 feet in diameter and could easily rest inside a small football stadium.read more on -

B) raising the temperature and reducing the volume of the gas.|-/