The phosphorus in all biological tissues can be traced back to .

a. phosphorus in animal bones.
b. atmospheric phosphorus gas.
c. phosphorus dissolved in the ocean and taken up by shellfish.
d. phosphorus weathered from rock.
e. volcanic activities.

Explain how the political influence of african americans leaders became weaker.

Why do we perceive objects as retaining their brightness under different lighting levels?

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.