One way embryonic cells can identify where they are within in an embryo is by engaging in the process of
A. cell differentiation or differential expansion
B. cell proliferation
C. programmed cell death
D. induction from adjacent cells
Ans: D. induction from adjacent cells
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Characteristics that have arisen in organisms as a result of common evolutionary descent are said to be ______________ characteristics.
A. homologous B. homoplastic C. adaptive D. derived E. ancestral
A behavior that can increase reproductive success of an individual male in a species is
A. All of the answer choices are correct. B. direct physical competition for the "right" to mate with a particular female. C. post-mating physical competition to block other males from subsequently mating with the female. D. the removal of the sperm from other males, so that there will be no successful fertilization. E. the ability to produce more sperm can be produced or released.
Which of the following statements is true regarding the wavelengths of light used in photosynthesis?
A. The smaller the wavelength of light, the more energy associated with it, so plants only use the lowest wavelengths of light in order to be most efficient at photosynthesis. B. The smaller the wavelength of light, the more energy associated with it. However, the pigments in plants can only absorb light within specific ranges of wavelengths, some smaller and some larger. C. The larger the wavelength of light, the more energy associated with it, so plants use only the highest wavelengths of light in order to be most efficient at photosynthesis. D. The pigments in plants can absorb all wavelengths of light and do so for maximum photosynthetic efficiency.
The earliest pollinators of flowers were probably ____ that visited flowers to chew on the petals and leaves
a. mice b. bees c. earwigs d. beetles e. grasshoppers