Nitrogen cannot be used by plants or animals in its gaseous form. Place the steps of the nitrogen cycle in order to show how nitrogen becomes usable to plants and animals.

Put the following steps of the convection process in the correct order. 1. gravity pulls cooler matter downward. 2. the matter expands and decreases in density. 3. an up-and-down flow of matter produces a convection current. 4. matter is heated. 5. warmed matter is forced upward. question 2 options: a) 4, 2, 5, 1, 3 b) 2, 4, 3, 1, 5 c) 3, 2, 5, 4, 1 d) 1, 4, 2, 5, 3

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

Which was most likely an effect on society that resulted from improvements in blood handling during world war i and world war ii?