Which is responsible for transporting oxygen-poor blood from the upper part of the body to the right atrium of the heart?

inferior vena cava

superior vena cava

pulmonary veins

pulmonary arteries

Previous pagenext pagepage 3 ofquestion 3 (1 point)which of the following consist of cells that do not have a nucleus? of the above

Plsss > .< compare and contrast the characteristics of flatworms rounds worms and earthworms

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.