One of the conclusions drawn from Darwin's theory of evolution is that:a
existing organisms can adapt to environmental changes.
b. genetic information can pass from organism to organism by means of DNA.
c. living organisms are composed of basic units called cells.
d. organisms living today descended with modifications from previously existing forms.
e. living organisms contain substances produced by cells.
D
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Which of the following statements is not true concerning the estrogen spike at the end of the follicular phase?
A. It has a positive feedback effect on the pituitary gland. B. It is followed by ovulation. C. It causes a decline in gonadotropin-releasing hormone from the hypothalamus. D. It is followed by a surge of LH. E. It has a positive feedback effect on the hypothalamus.
Which of the following best explains why many different species can live together within an ecosystem with limited resources?
(A) Each species lives in a slightly different habitat. (B) Each species occupies a different niche. (C) Each species inhabits a different biome. (D) Each species makes up a different population.
Which of the following causes a dividing cell to pinch in two by contracting like a purse string?
A. centrioles B. actin filaments C. microtubles D. pili E. intermediate filaments
The function of the notochord is taken over by the ________ in vertebrates.
A. spinal cord B. backbone C. brain D. ribs