Nonrenewable resources are a. are worse than renewable resources b. not used as much as they used to be c. consumed faster than they are replaced d. replaced as quickly as they are used

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.

Nucleic acid certain protein cell membranes certain carbohydrates

Which best describes a gene? a. a sister chromatid b. a chromosome c. a tetrad d. a piece of a chromosome