Answer: By studying the fossil record we can tell how long life has existed on Earth, and how different plants and animals are related to each other. Often we can work out how and where they lived, and use this information to find out about ancient environments. Fossils can tell us a lot about the past.
They only vary only in their "Lipid Groups"
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Answer:
the ecosystem will be disturbed... the animals feeding on it will be reduced due to lack of food and the animals on which the star fish was feeding will be increased which causes a total imbalance in ecosystem..
abiotic factors.
An abiotic factor is a non-living part of an ecosystem that shapes its environment.