The fact that children in different cultures in the age at which basic motor skills appear demonstrates that a. vary somewhat; genetic factors can slow or accelerate early motor development b. vary somewhat; environmental factors can slow or accelerate early motor development c. do not vary; genetic factors alone determine early motor development d. do not vary; environmental factors alone determine early motor development

Match the digestive enzymes to the macromolecules they to digest. break down fats into glycerol and fatty acids break down carbohydrates into simple sugars break down nucleic acids into nitrogenous bases and simple sugars break down proteins into amino acids

Which process is involved in growing crops? irrigation transportation recreation condensation

The gene that causes sickle-cell disease is present in a higher percentage of residents of sub-saharan africa than among those of african descent living in the united states. even though this gene causes sickle-cell disease, it also provides some protection from malaria, a serious disease that is widespread in sub-saharan africa but absent in the united states. discuss an evolutionary process that could account for the different percentages of the sickle-cell gene among residents of the two regions.