Which of the following explains why methane gas is an important greenhouse gas to reduce? A. It can absorb more heat than the same amount of carbon dioxide.

B. It makes secondary pollutants that are harmful to the atmosphere.

C. It absorbs the other greenhouse gases and becomes more potent.

D. It can be absorbed by soil and cause eutrophication in water.

Are the layers of rock above and below the coal older or younger?

True or false: (a) the strings of little red dots represent carbohydrates. (b) the model is called a bilayer because there are two main types of molecules present, lipids and proteins. (c) the many black lines represent amino acid tails. (d) this model shows membrane transport. (e) the blue ovals are hydrophobic. (f) the blue ovals represent phospholipid heads.

Identify the area on the image where the force of attraction is the strongest.