As described in section 46.1 and Fig. 46.6 of your book, natural populations are affected by both density-dependent and density-independent factors
In a population affected mainly by
density-dependent factors, would you expect natural selection to favor an r-selected or Kselected
life history? __________
What will be an ideal response?
K-selected
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Development of an animal is connected to the genes that are expressed during development. Researchers propose that ...
A. increases in the number of Hox genes have been instrumental in the evolution of many animal species. B. the greater the number of Hox genes the more complex the body plan of the animal. C. both BMP4 and Hox are associated only with digit development in animals. D. increases in the number of Hox genes have been instrumental in the evolution of many animal species and the greater the number of Hox genes the more complex the body plan of the animal are both correct. E. increases in the number of Hox genes have been instrumental in the evolution of many animal species, the greater the number of Hox genes the more complex the body plan of the animal, and both BMP4 and Hox are associated only with digit development in animals are all correct.
Which of the following is not a characteristic of passive transport?
A) It requires binding of the molecule to be transported. B) It is specific for the molecule being transported. C) The energy for transport is generated by the gradient of the substance being transported. D) The energy for transport is generated by the molecular bonds of the substance being transported. E) Transport of the substance is the result of a conformational change.
Which of the following organs is not considered part of the digestive system?
a. tongue b. spleen c. gallbladder d. pancreas e. salivary gland
The expression "one bad apple spoils the whole bunch" probably has to do with the action of ethylene on fruit ripening.
Answer the following statement true (T) or false (F)