How many contacts are there between the second and third newest geologic units on this map? ___contacts

What are the four basic classes of organic molecules how do they differ structurally and functionally

Hey me with this one❤☺❤ how do you say that a cell also has a life span and death like an organism? give one example.

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.