1. The correct answer is 4. Carbon can bond to 4 other atoms, exponentially increasing its ability to make different molecules.
2. The correct answer is 3. An organic compound (or molecule) is any atom (usually hydrogen) that bonds with carbon.
3. The correct answer is the third option (8 electrons). Valence electrons in the outer shell are those can form a chemical bond. When (most) atoms have 8 electrons in their outer shell, they are then considered to have maximum stability.
4. The correct answer is 2. These macromolecules all contain carbon and hydrogen, making them organic compounds.
Answer:
If there would be no biosphere on earth the atmosphere would be quite different. There would be no oxygen to support because oxygen is liberated by plants in photosynthesis so no plants means no oxygen. The earth would be a planet without life just like Venus and Mars. Therefore, no organism would be surviving in the world.
There would be no negligible green house effect and global warming since it is all created due to activities of men.The earth's atmosphere would be much cleaner and with lesser amount of CO2 and O2 but no organism would be there to use them.
Hope it help!
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Organisms show dominant traits in most cases, hope this helps :)
