Answer:
Why don't we have a complete fossil record of all life that's ever lived? Fossil formation requires a rare mix of physical and biological conditions. Fossils must be exposed at Earth's surface to have a chance of being found. Fossils can be destroyed when rocks erode, melt, or change composition.
Explanation:
For many reasons, the fossil record is not complete. Most organisms decomposed or were eaten by scavengers after death. Many species lacked hard parts, which are much more likely to fossilize. Some rocks and the fossils they contained have eroded and disappeared.
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When acid precipitation occurs, it effects Earth in a few ways. One way is that when the acid rain soaks into the soil, it removes the nutrients that plants rely on. This, in turn, damages a lot of vegetation. Another way is that it raises acidity levels in water. The higher the acid levels, the more it harms the organisms living in water.
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Info from: https://www.eartheclipse.com/environment/critical-effects-of-acid-rain.html
Protists obtain food in one of three ways: absorption, ingestion, and engulfing. Most protozoa are free-living in soil and water and enter the activated sludge process through inflow and infiltration. Bacteria are the primary food source for protozoa
1.) Ask a question or Identify a problem
2.) Research
3.) Form a hypothesis
4.) Experiment
5.) Draw a conclusion
They found the fossil evidence in a place where there was once a body of water such as the ocean.
