18: D, homologous
20: B, DNA
I can’t see 17 or 19!
Cooling a substance causes molecules to slow down and get slightly closer together, occupying a smaller volume that results in an increase in density
<span>D. There would be much less precipitation and evaporation.
Much of the precipitation comes from the evaporation of water from the ocean and posterior condensations into clouds that go over the mountains. If the mountains were to be far from the ocean, there would be much less precipitation and, therefore, evaporation also. </span>
A vaccine works by stimulating the immune system to produce antibodies without actually infecting someone with that disease. They trigger the immune system to produce its own antibodies as though the body has been infected with the disease. But a vaccine will not make someone immune to a disease, it will simply help the body be able fight the infection better.
The answer would be C valleys formed by a glaciers.