The probable extinction of the ivory-billed woodpecker was mainly driven by
A. direct exploitation.
B. introduced species.
C. habitat destruction.
D. climate change.
E. genetic drift.
C. habitat destruction.
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Answer the following statements true (T) or false (F)
1. If a cell contains 20 units of DNA during G2, it will have 40 units of DNA during S. 2. During prometaphase, the sister chromatids organize into a single row in the center of the cell. 3. A cell undergoing meiosis that contains sister chromatids may be either haploid or diploid. 4. One major difference between metaphase I and metaphase II is the presence or absence of bivalents. 5. Sexual life cycles include both haploid and diploid stages.
Rabbits were introduced to Australia in the 18th century. There were no other rabbits in Australia and there were no
natural predators for the rabbits. It is likely that their population experienced ____.
a. per capita birth rate b. logistic growth c. exponential growth d. sudden death e. density independence
The banding patterns are different for non-homologous chromosomes. Indicate whether the statement is true or false
The ranges of black bears and brown bears overlap. However, black bears spend most of their time in the woods and
brown bears spend most of their time along the river. Which of the following best describes why black and brown bears do not interbreed? a. habitat isolation b. temporal isolation c. biological isolation d. evolutionary isolation e. environmental isolation