Select the correct answer from each drop-down menu. Skulls of Homo sapiens were found during an excavation. The skulls were preserved because the bodies were frozen. So, these fossils are
fossils. The image shows the evolution of skulls beginning 2 to 3 million years ago. Based on the image, modern human skulls
ape skulls.

Which best explains why viruses do not have special structures or enzymes that allow them to make their own food? viruses can use energy in living cells that they infect. viruses can replicate inside a host that they infect. viruses can cause contagious illnesses in host cells. viruses integrate their rna or dna into infected cells.

Which best describes red blood cells? a. they are colorless b. they protect against disease-carrying microorganisms c. they transport oxygen throughout the body d. they aid in blood clotting

Which element forms the basis of all organic organisms a carbon b oxygen c hydrogen d nitrogen