Scientists in Chicago measure the amount of oxygen and carbon dioxide in Lake Michigan. This helps them determine the health of the lake ecosystem. In July, scientists noticed a large decrease in oxygen levels in the lake. The decrease in oxygen could be due to: a) A decrease in fish populations.
b) A decrease in plant growth.
c) An increase in plant growth.
d) An increase in rain water supplied to the lake.

Which would be the most useful source of evidence to support mcneill's contention?

Duchenne muscular dystrophy is a serious condition caused by a recessive allele of a gene on the human x chromosome. the patients have muscles that weaken over time because they have absent or decreased dystrophin, a muscle protein. they rarely live past their twenties. how likely is it for a woman to have this condition? a) women can never have this condition.b) one-fourth of the daughters of an affected man would have this condition.c) one-half of the daughters of an affected father and a carrier mother could have this condition.d) only if a woman is xxx could she have this condition.

What do isotopes of uranium have the same number of? what do they have a different number of? a) same number of protons; different number of electrons b) same number of protons; different number of neutrons c) same number of electrons; different number of protons d) same number of neutrons; different number of protons