New York State Chemistry RegentsNew York State Earth Science Regents

Living Environment Regents August 2010 Question 07 PDF Print E-mail
Friday, 27 May 2011 12:15

Correct answer: (3) natural selection

Natural selection refers to the differential success in the reproduction of different phenotypes resulting from the interaction of organisms with their environment. Natural selection can bring about adaptive evolution which is a blend of chance and sorting-chance in the origin of new genetic variation and sexual recombination, and sorting in the workings of selection as it favors the propagation of some chance variations over others. From the range of variations available to it, natural selection increases the frequencies of certain genotypes and fits organisms in their environments.

Incorrect answers:

(1) ecosystem stability

Ecosystem stability refers to the unity of organisms on Earth. Unity and diversity are the two main factors that characterize life on Earth.

(2) homeostasis

Homeostasis refers to the steady-state physiological condition of the body.

(4) direct harvesting

Direct harvesting is not a form of natural selection because it involves bias from the growers. This is usually done in agriculture to choose the species with specific characters desired for breeding.

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