Assuming the carbon cycle is a closed system, which of the following statements is true?
a. mass and energy are conserved in the carbon cycle.

b. as population sizes increase, more carbon is produced.

c. when all the fossil fuels are used up, there will be no more carbon.

d. the sun absorbs energy from the carbon cycle.

Which of these statements are true about scientific theories and hypothesis

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.

Which topic is most likely to be studied by bo which topic is most likely to be studied by botanist? insect metamorphosis, viral infection, plant growth, animal physiology