Answer:
Because of gravity, in matter does not leave the system so the chemical matter we have on Earth will always be here
Answer:
<h2>B
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Explanation:
1. Amphibian's heart is three-chambered from which two are atria and only one is ventricle.
2. And there is two circulatory pathways having different routes.
3.There is mixing of oxygenated and deoxygenated blood in case of amphibians.
4. And in case of mammals there is no mixing of blood,, both the oxygenated and deoxygenated blood is completely separate.
5. Mammal's heart contain four chambers from which two are atria and two are ventricle, and they completely separate both the oxygenated and deoxygenated blood.
They happen in the early fall
Answer: 3 nitrogen atoms and 12 hydrogen atoms
Explanation: In a chemical equation, number represents the atoms present. Number at the base of the atom must be multiplied with the number written at the first atom for example 3NH4 so here for Hydrogen 4 is multiplied with 3 i.e. 12Hydrogen but for first atom Nitrogen only 3 is there so 3 nitrogen and 12 Hydrogen is present.
