The current rate of species extinction is conservatively estimated at _______ times greater than the
a) 20 to 200
b) 50 to 5,000
c) 100 to 1,000
300 to 3,000
Of the four modes of species interaction, trophic interactions are associated with
Where would you find a cold desert biome?
Which atmospheric layer enables radio transmissions?
About _______ percent of current carbon dioxide emissions are being absorbed into the planet's oceans.