Who wants to do a zoom with me and somme freinds

Plants in the tundra biomes have had to adapt to live long periods of time without a. cool temperatures b. sunlight c. oxygen d. water

Scientists think that convection currents flow in earth’s a. continents. b. mantle. c. lithosphere. d. inner core.

Given: circle a externally tangent to circle b. how many possible common tangents to circles a and b can exist? 2 3 4