Along with an erect structure that enables us to walk on two legs, what is a feature that distinguishes the human skeleton from most other animals?
a. exoskeleton
b. four-chamber heart
c. four limbs
d. opposable thumbs

An easy way to calculate the amount of energy available at each level is to what?

Donde se encuentra el adn nuclear en un organismo eucariota?

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.