Explain how an oligotrophic lake can become eutrophic
What will be an ideal response?
An oligotrophic lake is poor in nutrients and organic matter. Therefore, as nutrients and organic matter
accumulate, a lake can become eutrophic. Nutrients added to a lake, for example, in runoff, can cause a
lake to become eutrophic. Eutrophication is also a natural process where sediments accumulate over
long periods of time.
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Which of the following endocrine organs and hormones are not paired correctly?
A. anterior pituitary gland: vasopressin B. posterior pituitary gland: oxytocin C. hypothalamus: releasing factors D. anterior pituitary gland: growth hormone E. posterior pituitary gland: antidiuretic hormone
The cell in the accompanying illustration is in ____
a. prophase I. b. metaphase I. c. anaphase I. d. prophase II. e. anaphase II.
What does the figure suggest about patterns of biodiversity for particular groups of organisms?
A) Species diversity is highest at the equator. B) Species diversity is highest at the poles. C) Climatic influences are most important in determining areas of higher diversity. D) Diversity patterns are unpredictable.
Infants require many nutrients early in life, including lipids such as fats. A low-fat diet for infants is not recommended because, among other things, it can affect the development of the nervous system. Why does the developing nervous system need
lipids? A) Fats are needed for energy because infants are often on a low-carbohydrate diet. B) Lipids are needed to produce the polypeptide neurotransmitters used by neurons. C) Glial cells need lipids to produce the myelin sheath. D) Fats are required to generate action potentials on nerve cells.