ANSWER IS C HOPE IT HELPS :D
Answer:
The smallest unit of matter is an atom.
Explanation:
It is an atom because an atom is the smallest thing, that has weight and takes up space.
Answer;
A. the Sun's rays are nearly perpendicular to Earth's surface.
Explanation;
-Tropical region receives more solar radiation not only because the Sun’s rays hit the region more directly, but also because they travel through less of the atmosphere to get there.
-Some radiation is absorbed as it travels through the atmosphere, so less energy is lost in tropical regions.
This means that it only allows for select materials to be able to move across it and not all molecules and other substances floating in the external environment. The proteins and the phospholipid Bilayer help to contribute the selectivity of the membrane.
If u mean from actually 1 pyruvate i can say something between 15-16
