Alex is studying leg bone fossils of an extinct species to see if the extinct organism could be an ancestor of a certain living species. Which of the following types of evidence could
he obtain from studying fossils?
A. genetic evidence
B. embryological evidence
C. structural evidence
D. developmental evidence

9. the history of life on earth is recorded in

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.

When it is summer at the south pole, a. the northern hemisphere is tilted toward the sun. b. the southern hemisphere is tilted away from the sun. c. the northern hemisphere is tilted away from the sun. d. both the southern and northern hemispheres are tilted toward the sun.