Darwin's ideas on evolution were advanced for his time. His approach to science and natural selection were supported by what main tenant?
A. The world is fixed and constant.
B. Operation of natural laws produces constant change and improvement.
C. Species were unchangeable over the course of time.
D. Various organisms and their structures resulted from a spontaneous action.
Answer: B
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A. Alexander Fleming. B. Louis Pasteur. C. Edward Jenner. D. Robert Koch.
Monoclonal antibodies
A. are usually of different classes. B. usually recognize several epitopes. C. have the same variable regions. D. are always IgE.
Placental mammals give birth to more fully developed offspring than marsupial mammals and therefore have a greater chance of survival. This helps to explain why placental mammals from North America displaced many native South American marsupial mammals when a land bridge formed between the two continents.
a. true b. false
A stem that cannot increase in diameter is lacking what type of tissue?
A. Protoderm B. Vascular cambium C. Xylem D. Procambium E. Ground meristem