How does planting high-yield crop varieties make farming more sustainable?
O
A. It keeps chemicals from entering the watershed.
O
B. It increases the amount of water needed.
O
C. It decreases the amount of land needed.
O
D. It keeps soil fertility from diminishing over time.

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.