Over the decades local and global ice ages have lowered sea levels. as a result, there is often a decline in marine diversity due to a) migration of bottom feeders into the region. b) changes in the temperature and salt in water. c) migration of fresh water fish to places near the mouths of rivers. d) formation of breeding grounds for various species in the shallow waters.

yes? sounds right, but you didn’t ask a question.

the relative atomic mass of an element is the mass of one atom of that element, relative to 1/12th of the mass of a  1212c atom. to convert to an absolute mass in kg, it is necessary to multiply by  1.661×10−271.661×10−27.

the relative atomic mass is roughly equal to the number of neutrons, plus the number of protons, in the nucleus of the atom.

for elements with more than one stable isotope (different types of nucleus with different numbers of neutrons but the same number of protons), the quoted mass is usually the average mass, weighted by the relative abundance of the different isotopes.

the menstrual cycle – higher tier. negative feedback mechanisms affect the production of hormones in the menstrual cycle. oestrogen also stimulates the release of lh (luteinising hormone) from the pituitary gland, which in turn controls the production of progesterone.