A four-chambered heart, hollow limb bones with supporting struts, and a keeled sternum are features associated with

most modern ____.



a. mammals
b. snakes
c. turtles
d. lizards


e. birds


ANSWER: e

Biology & Microbiology

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a. True b. False Indicate whether the statement is true or false

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As an animal matures, it forms attachments to other individuals and develops preferences. This process is called  

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An experimental condition applied to research subjects is called a

a) treatment b) control c) randomization d) placebo e) variable

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