Answer:
1.States that organelles such as chloroplasts and mitochondria were once free-living prokaryotes which eventually lived symbiotically within larger cells, forming modern day eukaryotes.
2.Eukaryote, any cell or organism that possesses a clearly defined nucleus. The eukaryotic cell has a nuclear membrane that surrounds the nucleus, in which the well-defined chromosomes (bodies containing the hereditary material) are located.
Because the lower levels of the food chain have the most energy so more organisms can be sustained, but as you go up the food chain, less and less energy is transferred so less organisms can survive
Deadly particles like SO2 that comes into contact with the air will form air pollution. This deadly particles will then form acid rain. When those rain comes into contact with water supply, they turn the water acidic. They will cause river to be too acidic for fishes and other living organisms to survive.
The answer is; chromosomes.
During interphase, the chromosomes are usually hard to visualize even under a microscope becaue they are long thin threads called chromatin. During the initiation of mitosis, the chromatin undergo structural changes that condense and shortens them and they becomes visible to even a light microscope.
