The high diversity of pigeons in Papua New Guinea’s tropical rain forests is possible because:
1.They occupy very different niches, so have different forms.
2.Predation of one species by another has diversified their forms.
3.They are able to take advantage of the diversity of food-bearing trees in the forest.
4.They are symbiotic species so size difference does not matter.
3
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Which of the following statements about mammalian cleavage is false?
A. The embryo increases in overall size during cleavage. B. It occurs more slowly than cleavage in other organisms. C. Early divisions do not occur at the same time. D. Zygotic transcription begins as early as the two-cell stage. E. Cell divisions extend completely through the egg.
Pigments, specifically, function for
photosynthesis by which of the following?
a. electron excitation and energy emission b. reflection of light energy c. splitting water into hydrogen and oxygen d. capturing light e. none of these
Carbon-12 has six protons and six neutrons in its nucleus. Carbon-14 has six protons and eight neutrons in its nucleus and is radioactive. Carbon-14 is an example of a(n) ________.
Fill in the blank(s) with the appropriate word(s).
What secretion emulsifies dietary lipids, allowing efficient digestion of fats?