What are the current infection rates of HIV across the globe?

In general, characteristics that an organism survive and reproduce become more common over time. what mechanism of evolution causes this?

Ras is a g-protein that is activated when a growth factor attaches to egfr. its activation results in the replacement of a gdp molecule with a gtp molecule, thus allowing a signal transduction pathway to be activated. considering the signal pathway illustrated on this page, what is one potential outcome of a mutation in the ras gene that leads to ras protein hyperactivity. be specific.

All phases of matter may have a fixed mass