"In DNA thymine pairs with adenine, but in RNA uracil pairs with adenine. Similarities: - DNA and RNA are made up of monomers called nucleotides. - DNA and RNA both have 3 nitrogenous bases: Adenine, Cytosine and Guanine."
-enotes
Feb 18, 2009
I'm assuming that by elements, you mean the elements in the periodic table. In that case, the elements form complex compounds in plants and animals which are essential to their survival.
For example, sugars like glucose are used to provide energy which is used for various activities in plants and animals, especially active transport.
The structure that they are showing is the general structure of an amino acid. If you look at the left side there's NH2 (an amino group). On the right side is COOH (a carboxylic acid group) and the R is the part that varies depending on the amino acid --this way you can make up the 20 different amino acids but all with the basic structure shown in the diagram.
Answer:
The knuckles are like a jagged surface. When they rub together, they act as obstacles to each other. It’s difficult to move the hands freely as the knuckles catch and release one another. In the case of tectonic plates, if two plates rub, they release large amounts of energy, which can cause earthquakes.