The diagram shows the life cycle of a pine tree. What happens during the stage labeled 6?

For Ap3x the answer is:

A seed that contains an embryo plant grows into a young pine tree.

Explanation:

when atoms of different types of elements join together, they make molecules called compounds. water consists of compound molecules made up of 2 hydrogen atoms and 1 oxygen atom. this is why it's called h2o. water will always have 2 times the number of hydrogen atoms as oxygen atoms.

since there are no options posted i'll give you a few examples.

a dolphin's flipper, bird's wing, cat's leg.