The openings in leaves that function to exchange gases are called ____

a. cuticles
b. stomata


c. guard cells
d. pits
e. pores


ANSWER: b

Biology & Microbiology

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Bacterial cells typically have ____ while eukaryotic cells have ____

a. a single circular chromosome; many linear chromosomes. b. several circular chromosomes; many linear chromosomes. c. one linear chromosome; many circular chromosomes. d. two circular chromosomes; numerous circular chromosomes depending on the species. e. numerous circular chromosomes depending on the species; many linear chromosomes.

Biology & Microbiology

Which of the following plants were dominant

in the Carboniferous period?

a. club mosses b. peat mosses c. ferns d. liverworts e. more than one of these

Biology & Microbiology

Most biologists recognize __________ domains

a. 3 b. 4 c. 5 d. 6 e. 12

Biology & Microbiology

Looking at the tree above, draw a tree that resolves two of the four shown polytomies and explain why you are able to do so using the provided tree and your own illustrations

What will be an ideal response?

Biology & Microbiology