In the ionosphere, the collision that raises the energy levels of oxygen and nitrogen occurs between which of the following? Select all that apply. gas atoms protons electrons neutrons

The place where an oraganism lives and that provides the things it needs to survive is its

the mitochondria, where cells energy is made, is often considered to be the cells control system (t or f)

Which statement about the polarity of DNA strands is true? A) The 3' end has a free OH groupB) The 5' end has a free OH groupC) The 3' end has a free phosphate group

Compare and Contrast the current model of the solar system vs. the historical model of the solar system

9. In the synthesis of proteins, what is the function of messenger-RNA molecules? 1) They act as a template for the synthesis of DNA. 2) They carry information that determines the sequence of amino acids. 3) They remove amino acids from the nucleus.

When you look out the window, you can see constantly moving air. air is cycled in order to reach equilibrium. B) since these change the density of air and we know the air flows from the region of high density to the region of low density.

What effects do deforestation have on the animals?

Which best defines a diploid cell during meiosis? a cell that has double the number of chromosomes as the parent cell a cell that has half the number of chromosomes as the parent cell a cell that has double the number of chromosomes as the daughter

What is the best definitionof magnetosphere? a. a magnetosphere is a magnetic field around earth. b. a magnetosphere is the groups of atoms that are lined up inside a magnet. c.

True or false: tertiary sources can draw from, or summarize, a secondary source.