In the straightedge and compass construction of an angle bisector, which of the following reasons can you use to prove that ab and ac are congruent?
a. ab and ac are both radii of circle a.
b. ab and ac are both radii of circle c.
c. bc and ab are both radii of circle a.
d. ab and ac are both chords of circle a.

All of the following statements about the biosphere are true except: a. light and heat from the sun do not affect the biosphere. b. the biosphere gets resources from earth's crust, hydrosphere and atmosphere. c. like "biology", the name for the biosphere comes from the greek word for life. d. the biosphere includes all living organisms on earth's surface.

Look at the photo i can’t do geography

Lomexico, central america, and the caribbean: mastery testselect the correct answer.which of the following was the leading cause of death among native americans after the arrival of europeans? a.conquistadorsb.diseasec.starvationd. warreset