Science Group

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Science Group

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1601
A. Extinction of all predators
B. A constant population
C. Competition and struggle for existence
D. Unlimited resources
Answer: Producing more offspring than resources can support leads to competition among individuals.
1602
A. Younger than those found in upper layers
B. The same age as upper layers
C. Unrelated to upper layers
D. Older than those found in upper layers
Answer: According to the principle of superposition, deeper layers of rock contain older fossils.
1603
A. Artificial selection
B. Natural selection
C. Extinction
D. Speciation
Answer: Choosing high-milk-yield cows for breeding is artificial selection by humans.
1604
A. Ostrich
B. Chimpanzee
C. Whale
D. Shark
Answer: DNA comparisons show that chimpanzees share the greatest genetic similarity with humans among living species.
1605
A. Time plays no role in evolution
B. Evolution happens only in an instant
C. Evolution requires very long periods of time
D. Evolution occurs within a single generation
Answer: Evolution is a gradual process that typically occurs over millions of years across countless generations.
1606
A. Rocks
B. Fossils
C. Weather
D. Individual organisms
Answer: Natural selection operates on individual organisms through their survival and reproductive success.
1607
A. Adaptation
B. Disorder
C. Parasite
D. Fossil
Answer: An adaptation is any inherited trait that improves an organism's chance of survival and reproduction.
1608
A. A constant, unchanging habitat
B. Long-term isolation of a population with accumulated variations
C. Short-term mixing of all populations
D. Removal of all variation
Answer: Isolation plus accumulated variation allows a population to evolve separately until it becomes a distinct species.
1609
A. Artificial selection
B. Pure coincidence
C. Common ancestry
D. Convergent evolution only
Answer: The shared skeletal plan of mammalian forelimbs indicates that these species evolved from a common ancestor, a case of homology.
1610
A. Fossil record
B. Anatomy only
C. Embryology only
D. Molecular biology
Answer: Shared genes and similar DNA sequences across species are molecular evidence of common descent.
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