Which of the following statements is true about solar eclipses?

the earth blocks the light of the sun, and casts a shadow on the moon.
solar eclipses usually last longer than lunar eclipses.
a total solar eclipse can be observed only from a certain region on the earth.
solar eclipses occur when the earth is in a direct line between the sun and the moon.

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.