How many sets of human chromosomes are in a spermatid?

What are the most explosive events that occur on the sun? umbras solar flares solar winds prominences

Any sound above what db can cause hearing loss in human beings

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.