Which of the following is an example of chemical weathering? plant roots pushing through a hole in a rock and cracking it. ice freezing in the crack of a rock and splitting it apart. carbonic acid wearing away the minerals in a rock. wind rubbing sand against a rock and wearing it down.

Which of the following is one of the four conditions necessary for natural selection to occur in a population? fewer organisms are born than the habitat can support mutation does not occur organisms have identical characteristics variation is inherited

Twind is considered to be an abiotic factor because it.?

This is a typical grassland food web. it is also a small picture of an important cycle on earth: the carbon cycle. describe how the carbon gets into this food web. a) bacteria and fungi, the decomposers, recycle carbon from dead organisms. b) carbon is found in the grass and is passed from one level to the next in this food web. eliminate c) all living things give off carbon dioxide as a by-product of respiration and it is released into the atmosphere. d) plants use carbon dioxide as a reactant in photosynthesis, to make usable chemical energy in the form of a sugar.