Research on starlings indicates that young birds migrate by ________, but older birds use true ________.
A. navigation; migration
B. orientation; navigation
C. navigation; orientation
D. migration; orientation
Answer: B
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The transformation frequency of very competent cells is about 10-6, or about 1 in 1,000,000 when an excess of DNA is used.
Answer the following statement true (T) or false (F)
Which of the following does not contribute to the formation of dead zones?
A. ocean acidification B. fertilizers from agricultural runoff C. eutrophication D. decomposition E. All of the answer options contribute to the formation of dead zones.
During this stage of mitosis, the nuclear envelope begins to break down and the spindle begins to form.
A. Metaphase B. Prometaphase C. Anaphase D. Prophase E. Telophase
Energy derived from cellular respiration can originate from
a) carbohydrates only b) fats only c) proteins only d) carbohydrates and proteins only e) carbohydrates, proteins, and fats