a connective tissue that is more flexible than bone and that protects the ends of bones and keeps them from rubbing together.

an organ in female mammals that produces milk for the mammal's young.

a mammal whose young are born at an early stage of development, and which usually continue to develop in a pouch of their mother's body.

a mammal that develops inside its mother's body until its body systems can function independently

an organ in most pregnant mammals, including humans, that links the mother and the developing embryo and allows for the passage of materials between them.

5 main groups of vertebrates

fishes, amphibians, reptiles, birds and mammals.

ectotherms, jawless fish- no jams or scales, cartilage skeletons-hagfish and lamprey cartilaginous fish-jaws, scales, and skeleton-sharks, stingrays bony fish-jaws, scales and pocket on each side, gills. goldfish

ectotherms, early life in water and adult life on land. example: frogs, toads and salamanders

ectothermic, scaly skin, lungs, lays eggs on land. turtles live in water and breath air. thick skin. example: alligator, snake, chameleon, turtles.

endothermic, lay eggs, have feathers, four-chambered heart, have wings with nearly hollow bones. owl, ibis, and rainbow bee-eater.

endothermic, hair and skin cover body, four-chamber heart. Monotreme-lay eggs, platypus. Marsupial- young develop in mom's pouches, kangaroo. Placental mammal-develop in mom's body, connect to mom through placenta, giraffe

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lesson 5

Question	Answer
cartilage	a connective tissue that is more flexible than bone and that protects the ends of bones and keeps them from rubbing together.
mammary glands	an organ in female mammals that produces milk for the mammal's young.
monotreme	a mammal that lays eggs
marsupial	a mammal whose young are born at an early stage of development, and which usually continue to develop in a pouch of their mother's body.
placental mammal	a mammal that develops inside its mother's body until its body systems can function independently
placenta	an organ in most pregnant mammals, including humans, that links the mother and the developing embryo and allows for the passage of materials between them.
5 main groups of vertebrates	fishes, amphibians, reptiles, birds and mammals.
fishes	ectotherms, jawless fish- no jams or scales, cartilage skeletons-hagfish and lamprey cartilaginous fish-jaws, scales, and skeleton-sharks, stingrays bony fish-jaws, scales and pocket on each side, gills. goldfish
amphibians	ectotherms, early life in water and adult life on land. example: frogs, toads and salamanders
reptiles	ectothermic, scaly skin, lungs, lays eggs on land. turtles live in water and breath air. thick skin. example: alligator, snake, chameleon, turtles.
birds	endothermic, lay eggs, have feathers, four-chambered heart, have wings with nearly hollow bones. owl, ibis, and rainbow bee-eater.
mammals	endothermic, hair and skin cover body, four-chamber heart. Monotreme-lay eggs, platypus. Marsupial- young develop in mom's pouches, kangaroo. Placental mammal-develop in mom's body, connect to mom through placenta, giraffe

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