An important message from the work of Thomas Malthus that influenced Charles Darwin was
A. animals tended toward "human perfection."
B. only a fraction of any population will survive and reproduce.
C. population size of humans can only increase linearly.
D. inheritance of acquired characteristics.
E. none of these. Charles Darwin was influenced by John Ray not Thomas Malthus.
B. only a fraction of any population will survive and reproduce.
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Homologous chromosomes undergo recombination during ____
a. prophase II b. metaphase I c. metaphase II d. both prophase I and II e. prophase I
A single pregnant female parakeet arrives in Hawaii early in its history. After millions of years her
descendants have successfully adapted to a variety of foods and habitats. This is the result of:
a. genetic drift b. adaptive radiation c. a higher rate of mutation d. punctuated equilibrium e. sympatric speciation
Which of the following proteins attaches a crawling cell to the substrate in a focal adhesion?
A) actin B) myosins C) ?-actinin D) integrin E) titin
A fomite is _________ that can transmit disease.
A) a vector B) an animal C) an inanimate object D) a cough or sneeze droplet