(20 points)why does the troposphere vary in thickness? A. Warmer air dissipates into the stratosphere. B. Cooler air is trapped in the troposphere. C. Cooler air contracts lowering the height, warmer air expands raising the altitude. D. Air turbulence in the troposphere varies the altitude. Water vapor weighs down troposphere and less water vapor cause it to rise higher.

In the respiration-photosynthesis cycle shown above, what are the products of cellular respiration that belong in box 2?

What is the most common structure of volcanoes?

The diagram below shows the layers of a rock having a trilobite: a rock column labeled rock is shown. the column has three layers. the bottommost layer of the rock has one shaded rhomboid shape, the middle layer has a rhombus with a diagonal along with two identical organisms marked as, trilobite, in the key, the top layer has two semicircles. a key is shown on the right side of the diagram. the shaded rhombus is marked as a, the rhombus with the diagonal is marked as b, the semicircle is marked as c which statement about the rock fossils is true?