Which of the following is NOT a unique feature of monotremes?
A) A spur on the hind feet that is venomous in males
B) Adults lose their teeth, which are replaced by horny plates
C) A bifurcate penis
D) Females produce an egg with a hard shell
E) Mammary glands lack nipples

Question

Quizplus · Accepted Answer

Monotremes, such as the platypus and echidna, lay eggs, but the eggs have leathery shells, not hard shells. This distinguishes them from reptile eggs, which can have hard shells.

Which of the Following Is NOT a Unique Feature of Monotremes