are heritable traits that provide a survival & reproductive advantage, & increase an organism’s : A. Characters, polymorphisms
B. Adaptations, fitness
C. Mutations, alleles
D. Genes, genome
E. Characters, strength

Awater molecule is polar because there is an uneven distribution of these between the oxygen and hydrogen atoms.

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.

What are tissues? a groups of tissues that work together b basic units of structure and function c groups of cells that perform the same function d multiple organs that perform a major function