Some bacteria in the human intestine aid in the digestion and absorption of nutrients, while utilizing these nutrients themselves as well. This is an example of:
A. commensalism.
B. mutualism.
C. parasitism.
D. predation.
E. an antagonistic interaction.
B
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Describe the breeding program initiated by King Frederick William of Prussia in the early 1700s to supply tall soldiers to the Potsdam Grenadier Guard. Was it successful? Why or why not?
What will be an ideal response?
The prevention of genetic exchange between two species because they reproduce at different times of
the day or year is called:a. hybrid sterility. b. genetic isolation. c. sexual isolation. d. mechanical isolation. e. temporal isolation
Red-green color blindness is a sex-linked recessive trait in humans. Two people with normal color vision have a color-blind son. What are the genotypes of the parents?
A) XnXn and XnY B) XNXN and XnY C) XNXN and XNY D) XNXn and XNY
Blood returning to the left atrium of a frog heart has just come from ________.
A. the brain or the skin B. the skin only C. the lungs or the skin D. the lungs or the brain E. the brain only F. the lungs only