Based on your understanding of biology, describe the relationship between these terms (definitions of each term will NOT be accepted): pathogen
virus
vector
emerging disease

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 did hunter gathers do to alter the environment?

What will happen if deforestation continue to destroy the green plant on the planet