When a person eats, the brain signals the stomach to start breaking down the food. Which two 1 point systems are involved in this process?*
Circulatory and respiratory
Nervous and digestive
Digestive and excretory
Muscular and digestive

In which situations is the principle of cross-cutting relationship useful in determining relative age?

The body of water found at number 4 on the map above is the

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.