<span>The answer is kingdom; species</span>
B, They are both made of protons, neurons, and electrons
Explanation:
Nitrogen and oxygen are both gases at normal warmth and pressure. They are more both elements. They both dissolve at a really cold temperature.
They're the principal components of Earth's atmosphere.
They're both diatomic gases.
They're both nonmetals.
They're both light elements.
Both of them are involved in the CNO cycle.
A closed system is a system that makes no physical or chemical exchanges with its environment. Of these systems provided as choices (tree, human, clock, car), only a clock does not make exchanges with the environment, except for energy.
Therefore, of that list, only a clock would be a closed system.
Hope that helped! =)
Without the greenhouse effect, there would be more ice on Earth’s surface. The answer is B.
