The average age of high school junior is 16.5 years old. How many days old is the average high school junior?

Skills of homo sapiens were found an excavation. the skulls were preserved because the bodies were frozen. so, these fossils are (blank) fossils.the image shows the evolution of skulls beginning 2 to 3 million years ago. based on the image, modern human skulls(blank) ape skulls.

When did stem cell research become known ? who discovered stem cell? what experiments or studies have been conducted so far?

The semi-conductors on the periodic table are classified as