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Scienc elesson 56

key terms

mammal a group of vertabrates
mammary gland milk producing gland thing in the mothers body.
diaphragm the combined action of the rib muscles and large muscles.
monotremes egg-laying mammals
Marupials mammals whose young are born at an early stage of development.
gestaion period the lenght of time between fertlization and birth.
placental mammal develpos inside its mothers body untill its body sytems can function independently.
placental an organ of pregnant female mammals that passes materials between the mother and developing embryo.
Created by: irockoutloud