Which of the following animals lay eggs with protective shells?

fish
amphibians
mollusks
reptiles

If only one option can be chosen;Reptiles. If its more than one then I'd put Reptiles and mollusks.

Explanation:

Reptile eggs are laid out of water and are surrounded by a protective shell, either flexible or inflexible. Mollusks are also known to lay eggs with a hard shell using calcite to construct the eggshells. Fish and amphibians generally lay eggs which are surrounded by the extraembryonic membranes but do not develop a shell, hard or soft, around these membranes. Some fish and amphibian eggs have thick, leathery coats, especially if they must withstand physical force or desiccation.

lunar landing mission. apollo 11 was the first manned mission to land on the moon. the first steps by humans on another planetary body were taken by neil armstrong and buzz aldrin on july 20, 1969. the astronauts also returned to earth the first samples from another planetary body.

explanation:

friedrich meischer discovered it in white blood cell