if the earth had not evolved it would be just like every other planet, no life forms, not polluted and pure. it would be clean and there would probably be a few organisms but not how we are now. Global warming would not be there and the plastic in the oceans would also not be there.
The answer is A. Hope this helps!
Endosymbiotic theory has it that both chloroplasts and mitochondria were once free living organisms which got taken into bigger cells - they provide the cell with energy, while the cell provides them with proteins and other things.
The two things this question ask about support that theory: chloroplasts and mitochondria are surrounded by a double membrane, which makes sense in that they kept their original membrane and the little bit of the cell's membrane when it engulfed them. And they have some of their own genetic material, though most of it is non-coding, which they have kept from the time when they were independent organisms. Hope that's helpful.
Answer:
b. Nitrification
Explanation:
Nitrifying bacteria are present in the soil that help in the oxidation process of ammonia that liberates the nitrite (NO2-) and nitrate (NO3-) compounds. These resulting compounds are captured by plants and this process is called nitrification. In the nitrification stage there are two chemical processes. That are:
• Nitrous: is the oxidation of ammonia (NH3) that results in the nitrite chemical compound (NO2-).
• Nitration: It is the oxidation of ammonia (NH3) that results in nitrate (NO3-).
