In the U.S., __________ is the main reason why more than 700 species are listed as threatened and
endangered.
What will be an ideal response?
ANS: habitat loss
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Which endocrine gland is small, cone-shaped, and attached to the posterior region of the epithalamus
A. Hypothalamus B. Thymus gland C. Pancreas D. Pineal gland E. Pituitary gland
Which of the following series is arranged in the correct sequence of occurrence during the fixation and subsequent use of nitrogen?
A. atmospheric nitrogen; bacterial nitrogenase; ammonia; conversion by plants or algae; synthesis of proteins B. atmospheric nitrogen; bacterial nitrogenase; conversion by plants or algae; ammonia; synthesis of proteins C. atmospheric nitrogen; ammonia; bacterial nitrogenase; conversion by plants or algae; synthesis of proteins D. atmospheric nitrogen; ammonia; bacterial nitrogenase; synthesis of proteins; conversion by plants or algae E. none of the other options displayed
Franklin worked closely with
a. Wilkins. b. Watson. c. Crick. d. Chargaff. e. none of these.
Edge effects are the result of which of the following?
A. Populations of flora and fauna have emigrated from the core of their population center to the edge of their habitat. B. Populations of particular species have decreased and are on the edge of extinction. C. Habitat fragmentation or habitat shrinkage has occurred, and thus the edge of the habitat has increased in relative proportion. D. Habitat fragmentation or habitat shrinkage has occurred, and thus the edge of the habitat has decreased in relative proportion. E. Metapopulations of some of the larger fauna have become more dominant on the landscape and as a result have increased the edge of their habitat.