how the different rocks were formed
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Fossils - quiz , ep
A fossil is the preserved remains of prehistoric organisms.
They are formed by the compaction and cementation of sediments filling buried organism.
Two fossils-
Lucy,  the 3.2-million-year-old ape "Lucy" was the first Australopithecus afarensis skeleton ever found, though her remains are only about 40 percent complete. The paleontologists on site were listening to the song by the Beatles, “Lucy in the Sky With Diamonds” the same night they unearthed the most complete skeleton of the Australopithecus afarensis (one of the earliest known human species).Before the fossil even received its scientific name, it was named Lucy.

Blood engorged mosquito, a prehistoric mosquito preserved in shale, was found at the bottom of a pond. The mosquito is estimated to be 46 million years old.It's the substance hidden inside the mosquito's body that's considered of most value. With the help of a scanning electron microscope and mass spectrometry, a group of scientists were able to find molecules in the blood in the mosquito's abdomen. This fossil can enable scientists to study whether complex molecules such as hemoglobin can survive for millions of years.

Trilobites had flattened, segmented, plated bodies that helped to protect them in seas that were increasingly filled with predators.