How can scientists determine what atmospheric CO2 levels were like hundreds—or even thousands—of years ago? Select all that apply
A. They can examine ice core samples from
Antarctica.
B. They can examine CO2 levels in the
outermost layer of Earth' atmosphere.
C. They can examine the number of stomata
in fossilized leaves.
D. They can examine the number of fossilized
dinosaur skeletons from different eras.
A,C
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Cold and freezing are very effective in killing bacteria
Indicate whether this statement is true or false.
Cartilage injuries do not repair themselves because ________. a. All of these choices are reasons cartilage injuries do not repair themselves
b. cartilage does not receive nutrients very easily c. cartilage does not contain blood vessels d. None of these are reasons as cartilage does heal itself. e. cartilage does not divide in adults
DNA evidence is sometimes used to address what legal issues? How reliable is DNA evidence in a court of law?
What will be an ideal response?
A hominin of Europe and Asia that became
extinct nearly 30,000 years ago was a. a dryopith. b. Australopithecus. c. Homo erectus. d. Homo neanderthalensis e. Homo floresiensis.