The semilunar valves are located in the 

A. left atrium.
B. major veins that enter the heart.
C. pulmonary artery and aorta.
D. right atrium.


C. pulmonary artery and aorta.

Biology & Microbiology

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Blood is a type of connective tissue because blood _____

A) has multiple cell types B) has an extensive extracellular matrix C) functions in transportation D) can be both liquid and solid

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Which of the following was NOT a common curriculum tool in colonial New England?

A. Bible B. McGuffey Readers C. New England Primer D. Horn Book

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Some genes that are expressed in the fetal stage are never expressed again in that individual's life. What do you think is the most common mechanism for preventing the expression of such genes?

What will be an ideal response?

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Water has very special properties that not all chemicals share. Which of the following is not a property of water?

A) is nonpolar B) prevents wide temperature fluctuations C) requires a lot of energy to evaporate it D) interacts with lots of different substances

Biology & Microbiology