What are the only mammals that lay eggs?  

A.  monotremes
B.  placentals
C.  marsupials


A.  monotremes

Biology & Microbiology

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What is it called when a single-celled zygote begins to develop by undergoing rapid cell division?

a. expansion b. differentiation c. cleavage d. meiosis

Biology & Microbiology

Compare and contrast the functions of the adrenal cortex and the adrenal medulla. In what way are they similar? In what way to the hormones produced differ in terms of their chemical structure and how their levels are controlled?

What will be an ideal response?

Biology & Microbiology

The first living cells were probably eukaryotic

1.True 2.False

Biology & Microbiology

Four of the five nitrogen-containing bases listed

below are bases used to construct DNA. Select the exception. a. cytosine b. adenine c. thymine d. guanine e. uracil

Biology & Microbiology