The total energy of motion in the particles of a substance; heat energy -
A material that does not allow heat or electrons to move through it easily.

The rate at which molecules water and oxygen can enter a cell is determined by the-

Plz plz plz quick! 49 points for whoever which of the following statements about greenhouse effect is true? *life on earth is suffering because of greenhouse effect *the greenhouse effect is caused by human activity *all greenhouse gases are harmful *life on earth would not exist without the greenhouse effect

The body is protected against harmful flu viruses by