Answer:
Before life began on the planet, Earth's atmosphere was largely made up of nitrogen and carbon dioxide gases. After photosynthesizing organisms multiplied on Earth's surface and in the oceans, much of the carbon dioxide was replaced with oxygen.
Explanation:
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Answer:
A. Compounds contain fixed ratios of different elements.
Explanation:
Water always has this 2:1 ratio of hydrogen to oxygen. Like water, all compounds consist of a fixed ratio of elements. It doesn't matter how much or how little of a compound there is. It always has the same composition.
Answer:
false
Explanation:
im not sure if this is the entire question but from what I can see, I would prove this false
They could look for similarities in the DNA or protein structuresof the organisms<span> and similarities in early development</span>
C. Pepsin is the hormone that is produced mainly in the stomach and regulates secretions of gastric juice.
