Which pair of characters are found without exception in all mammals?
A. Hair and vivipartiy.
B. Viviparity and mammary glands.
C. Viviparity and internal fertilization
D. Mammary gland and internal fertilization.
Answer:D
Which pair of characters are found without exception in all mammals?
A. Hair and vivipartiy. B. Viviparity and mammary glands. C. Viviparity and internal fertilization D. Mammary gland and internal fertilization.