12) A biologist is studying the possible role of earthworms on the fertility of farm soils. As part of this research, the number of earthworms per acre of farmland is being estimated. During the first phase of this study, a total of 5 one-meter square samples were taken per acre. The number of earthworms in each of the five samples was carefully counted and the results used to estimate the total number of earthworms per acre. How can this estimate of the number of earthworms per acre be improved?

Food provides molecules that serve as fuel and building material for all organisms. plants undergo photosynthesis and make their own food. other organisms, like us and the horse seen above, are consumers and eat food. how do all organisms use food as fuel? be sure to include the name of the process in your answer. me.

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.

The structure that houses the cells genetic information.