Why is the fossil record biased

Information in the fossil records are incomplete, scientists are left with certain biases concerning fossil preservation. Fossils are the preserved remains of organisms that are found in rocks. They give clues to how the earth has evolved in geologic past, and the nature of organisms that lived during that period in time.  A lot of biases are known with fossil preservation as a geologic record might not tally with the phylogenic relationship developed by biologists.  Some fossils can become lost in the geologic record due to the dynamic nature of our planet. Earth materials can be eroded and weathered causing preserved fossils to be lost and exposed.  Some organisms are naturally favored due to their physiology to be preserved as fossils in the geologic record. Others would be lost. This makes records of life in preserved as fossils highly subjective.

Hope this helps, good luck!

We don't have every organism that existed identified in the fossil record.

Explanation:

The fossil record is biased because we don't have a complete record of every organism that lived on Earth. It also favors organisms that had structures capable of being preserved.

From Penn Foster

a.) a destruction fo cells by viral reproduction

blood enters the heart through two large veins, the inferior and superior vena cava, emptying oxygen-poor blood from the body into the right atrium of the heart. as the ventricle contracts, blood leaves the heart through the pulmonic valve, into the pulmonary artery and to the lungs where it is oxygenated.