Ribosomes are the structures in which?

Me with these questions image attached

Pentane with molecular formula c5h12, exists in three isomeric forms. one shows linear carbon chains, another has one -ch3 groups present on the third carbon atom, and the third has two -ch3 groups present on the second carbon atom. what types of isomers are these? a. geometric isomers b. structural isomers c. halotropic isomers

Why does the earth spin slowly, not faster? is it possible to prove it scientifically? can you prove it with math?