The atmosphere of early Earth is currently thought to have contained:a
methane, water, ammonia, nitrogen, and oxygen
b. carbon dioxide, water, oxygen, nitrogen, and hydrogen
c. carbon dioxide, ozone, nitric oxide, water, and hydrogen sulfide
d. carbon dioxide, water, carbon monoxide, hydrogen, and nitrogen
e. carbon dioxide, carbon monoxide, water, hydrogen, and nitric oxide
d
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By the end of the Devonian period, which of the following plants populated the landscape?
a. flowering plants and trees b. mosses and other bryophytes c. ferns, horsetails, and seed plants d. algae and early vascular plants
Which of the following is not a true statement about the scientific method?
A. It does not apply to problems encountered in everyday life. B. It is a framework to consider evidence in a repeatable way. C. It is a framework to consider ideas in a repeatable way. D. It is a general way of organizing an investigation. E. It begins with observations.
You bite into your favorite late-night studying snack, mushroom cheese pizza, and think to yourself, "What exactly am I eating?" Which of the following parts of a fungi are smothered with cheese on your pizza?
a. an aggregation of spores formed into a club-shaped structure b. the extensive grouping of hyphae into the mycelium c. a bunch of yeast cells all packed together d. the short-lived reproductive structure called a fruiting body e. the non reproductive thallus
Figure 22.18
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Refer to the above figure for questions.
Which numbered item in the accompanying figure represents microspores?
A. 1 B. 2 C. 3 D. 4 E. 5