Carbon-14 in standard form

Iknow #2 is d. i just need to know why

When you mate two plants together the terms is called? answer it fast as possible plz! i have a test tomorrow!

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.