In which ways are rna and dna different?
a. rna has ribose sugar, dna has deoxyribose sugar
b. rna has uracil, dna has thymine
c. rna is single-stranded, dna is a double-helix
d. all of the above

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.