Why is it so important for archaeologists and other researchers to piece together the human fossil record

Explanation:

By piecing together as many human fossil records collected throughout history, archaeologists are able to try and understand how humans survived throughout history, what kind of life-changing events happened, how humans developed over the years, etc. All of this information is highly valuable as it can also help scientists come up with new theories on how we came to be on this Earth, using this data as evidence.

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.