How are fossils older than 60,000 years dated?
a. directly dating the fossil with 14C
b. directly dating the fossil with uranium 238
c. dating rock formations below the fossil only
d. dating rock formations above the fossil only
e. dating rock formations above and below the fossil
ANSWER: e
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Explain how the composition and distribution of codons among living organisms provide evidence for evolution from a common ancestor
What will be an ideal response?
People with type A blood have red blood cells that express one type of recognition protein, while those with type B
blood express a different recognition protein. People with AB blood express both recognition proteins. Why can a person with AB blood receive blood from a person with type A, but a person with type A blood cannot received blood from a person with type AB?
What will be an ideal response?Red algae contain ________, which absorb(s) blue-green and green light, allowing the algae to live in deeper water
a. phycobilins b. carotenoids c. chlorophyll a d. chlorophyll b
Adaptive radiation is NOT accompanied by:
a. migration to an island. b. a mass extinction. c. a devastating event, such as a volcanic eruption. d. climatic change. e. sympatric speciation