Soils vary throughout the world. Climate, elevation, plant growth; these are just some factors that influence weathering and soil formation. The tundra and the desert are alike in some ways; different in others. Both the tundra and the dessert have little available water for plant growth.

Imagine you are collecting soil samples from a desert location and the tundra. What might these soil samples have in common?

A) a very low amount of humus
B) lots of decomposing tree roots
C) very small, fine-textured soil particles
D) a large amount of sand and very little silt or clay

Which of these statements best describes the st. lawrence seaway? the st. lawrence seaway connects the st. lawrence river with the arctic ocean. the st. lawrence seaway provides an important trading route between the u.s. and mexico. the st. lawrence seaway provides an important trading route for the u.s, but has little value for canada. the st. lawrence seaway connects the great lakes, the st. lawrence river, and the atlantic ocean.

Juan and carol were studying invertebrates in biology. they knew that segmented or earth worms preferred a dark, moist habitat. during this lab, they would be investigating the responses of organisms called planaria or dugesia tigrina. these were simple flatworms that still had a one-way digestive system and a very simple nervous system. juan and carol placed the planaria in a petri dish containing cool, distilled water that was partially covered with black paper. they shined a light on the dish. next, they removed the paper and placed a small amount of chicken liver at one end of the dish. they added a few large salt crystals to the water. finally, they added drops of hot water to the cool water in the petri dish. their results can be seen in the data table. according to their experiment, all but one conclusion is valid.

These are the components of the reservoirs of carbon that are exchanged in our environment.