Which of the following is the building block of all proteins? Question 4 options:

A. Amino acids

B. Phosphate groups

C. Nitrogen bases

D.5 Carbon sugars

Why is earth's outer core hotter than earth’s oceanic crust? earth’s oceanic crust is denser than earth’s outer core is. earth’s oceanic crust has lava flowing from the mantle. earth’s outer core has a composition of solid iron and nickel. earth’s outer core is deeper within earth than oceanic crust is.