Which one of the following best illustrates a density-dependent limiting factor?
A. A farmer uses insecticide to kill large numbers of insect pests.
B. As the human population rises, more people will starve.
C. In the spring of the year, many animals disperse to new locations.
D. Plants usually have difficulty getting enough oxygen.
B. As the human population rises, more people will starve.
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Organic molecules that are required in small amounts in the diet are called ____ and have diverse roles, including participating in enzymatic reactions
Fill in the blank with the appropriate word.
Dehydration synthesis reactions are forms of ____
a. catabolism b. anabolism c. enzymatic deficiency d. intermediary metabolism e. denaturation
Which of the following causes heartburn?
a. the pyloric sphincter remaining too tightly closed b. the gastroesophageal sphincter remaining a little open c. the pyloric sphincter remaining a little open d. the gastroesophageal sphincter remaining too tightly closed
In some social insects, there are individuals that do not mate or may not be fertile but help look after other members of their group. Which statement regarding this situation is true?
A) Natural selection cannot act on the genes of nonreproducers since they do not leave offspring. B) The ultimate cause of this behavior is the need to keep their group safe. C) By protecting relatives, the nonreproducers increase the probability that their genes will be passed to the next generation. D) Lack of mating is an agonistic behavior.