Can someone help me please :)

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.

What is the molar mass of a gas that has density of 2.054 g/l

What best discribes the relationship between wavelength and frequency in a electromagnetic wave