Answer:
B.air density
Explanation:
Updraft and downdraft is the upward and downward movement of air.
It caused by differences in air densities. There could be differences in air current due to the heat that occur in the ground during the day time which makes air above more warmer than the air below. The air above is less dense as it rises above it becomes cool.
It also occur when air current moves over mountains.
Answer:
Adenine and guanine are purines, while thymine, cytosine and uracil are pyrimidines.
Hope this helps! Sorry no one answered your question sooner :(
Answer:
Atoms
Explanation:
Atom is the most basic unit of matter. Atoms are used to describe pieces of matter, but a different kind of atom makes up an element. A combination of atom of different elements creates a molecule. Let's say you have some water, the chemical formula is "H20." If you wanted to separate H and O, that gives you two atoms. H would be Hydrogen and the other atom is Oxygen. So when we combine these two atom they formed as the chemical formula H20.
True because every theories has been proven
Answer:
cell wall, chloroplasts
Explanation:
Only plants have a cell wall and chloroplasts.
