Most Mammals Are

Q30: The most accepted explanation for the mass

Q31: The _ are the "pouched" mammals.<br>A)monotremes<br>B)marsupials<br>C)ungulates<br>D)true placental

Q32: _ is a period of winter-long inactivity

Q33: Most female mammals undergo a(n)_ cycle,which includes

Q34: Mammals are considered to have evolved from

Q36: The length of time that mammalian young

Q37: Specialized guard hairs called _ occur around

Q38: The excretory organs of mammals are<br>A)protonephridia.<br>B)renal glands.<br>C)green

Q39: Muscles called _ are responsible for making

Q40: The marsupial mammals belong to infraclass<br>A)Prototheria.<br>B)Eutheria.<br>C)Metatheria.<br>D)Theria.<br>E)Mesotheria.