Which of the following is an example of reproductive isolation?

If an organ has six haploid chromosomes,how many chromosomes are present. 6 12

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.

As the earth formed, the force of gravity increased due to increased mass. what effect did this increased gravity have on the forming planet?