Four of the five answers listed below are barriers to invasion. Select the exception
a. intact skin
b. mucous membrane
c. gastric juices
d. blood plasma
e. lysozyme
D
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Non-smokers live about ____ years longer than smokers
a. two b. four c. six d. eight e. ten
Which of the following statements is NOT
generally characteristic of parasites? a. They are specialists and usually are able to affect only one variety of hosts. b. They inflict serious injury and kill their hosts. c. Some reside inside their hosts, whereas others live outside their hosts. d. Their host may be a plant as well as an animal. e. Plants as well as animals can be parasites
Which of the following is(are) true of water?
a. It forms spheres of hydration around charged substances and can form hydrogen bonds with many substances. b. It has a high heat-containing property. c. It has cohesive properties. d. It is a liquid at room temperature. e. It is all of the above.
Once the fertilized ovum has divided into two cells, it is called the ________
Fill in the blank(s) with correct word