AP BIOLOGY

Detailed explanation-1: -Livebearers are aquarium fish that retain the eggs inside the body and give birth to live, free-swimming young. Among aquarium fish, livebearers are nearly all members of the family Poeciliidae and include: guppies, mollies, platies and swordtails.

Detailed explanation-2: -Live birth is also rare in fish, accounting for about two percent of known species, including guppies and sharks.

Detailed explanation-3: -Fish reproduce by bearing live young or by laying eggs. Livebearers give birth to fully formed and functional young called fry. The eggs are fertilized and hatch within the female.

Detailed explanation-4: -Fish roe is another name for fish eggs. More specifically, it is the fully ripe and unfertilized eggs of a fish. Those eggs can be sourced internally from the ovaries or from an external egg mass. The term “roe” also applies to eggs from other marine animals, like scallops, lobsters and shrimp.