Which adaptation is found in the leaves of cacti?
A) They store excess starch.
B) They are dropped during periods of drought.
C) They have been modified into spines.
D) They are very large to absorb plenty of sunlight.
C
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Which of the following are organs of the immune system? (Check all that apply.)
_____ red bone marrow _____ spleen _____ thymus _____ thyroid _____ tonsils
What is the reason why we call "fossil fuels" as such?
a. They are the remnants of fuels. b. They are the remnants of fossils. c. They are the remnants of ancient forests. d. They are the remnants of modern forests.
Which of the following is an energy-requiring mode of transport that brings substances into a cell?
A) Osmosis B) Simple diffusion C) Active transport D) Facilitated diffusion
In order to view a specimen with a total magnification of 400×, a ________ objective must be used if the ocular is 10×.
Fill in the blank(s) with the appropriate word(s).