A child is born without a fully developed heart. He is normal in all other respects, and thus doctors believe that the problem most likely began early in development. During the formation of which embryonic germ layer did the original error most likely occur

Aprocess in green plants that involves the use of carbon dioxide and water in the production of glucose and oxygen using the suns energy

What do isotopes of uranium have the same number of? what do they have a different number of? a) same number of protons; different number of electrons b) same number of protons; different number of neutrons c) same number of electrons; different number of protons d) same number of neutrons; different number of protons

What are antigens and antibodies? how are they involved in the body’s response to incompatible blood?