Why do cells have a plasma membrane?

to separate proteins from the nucleus

to define the size of the cell

to separate the inside of the cell from its environment

to distinguish plants from animals

If the concentration of sodium is greater outside a cell than inside the cell, which process could move sodium out of the cell?

Which evidence is most likely used to indicate the beginning of solar system formation? Materials combined to form a mass. Materials were pulled together by gravity. Water condensed and collected to form oceans.

Real life example of block and tackle

What are pollutants that are put directly into the air as a result of human activity?

When two deep currents meet what happens

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.