1. Why does the troposphere vary in thickness? A. Warmer air dissipates into the stratosphere. Cooler air is trapped in the troposphere.

B. Air turbulence in the troposphere varies the altitude.

C. Water vapor weighs down troposphere and less water vapor cause it to rise higher.

D. Cooler air contracts lowering the height, warmer air expands raising the altitude.

Which of the following would be least likely to support the modern concept of biological evolution? ( 2 points) a)different species of organisms with similar bone patterns b)different species of organisms with similar reproductive rates species in c)different domains with similar metabolic pathways species in d)different kingdoms with similar cellular structures.

Need will mark ! which features are created by groundwater erosion and deposition? check all that apply. a. stalagmitesb. sinkholesc. rillsd. stalactites e. gullies f. rivers

Compare and contrast region e in the illustration above with region d. describe the physical characteristics of each region.