What happens when you drink through a straw
What will be an ideal response?
when the pressure in the straw is reduced, atmospheric pressure on the surface of the liquid pushes the liquid up the straw
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This atom in its unbound state has four valence electrons. These electrons readily form single, double, and even triple bonds among themselves to become stable. This atom is:
A. carbon. B. hydrogen. C. oxygen. D. nitrogen. E. phosphorus.
Humans acquire the arbovirus that causes epidemic encephalitis by
A. the fecal-oral route. B. human to human contact. C. contaminated food. D. the bite of an infected mosquito
Suppose you explored a new planet and found a photosynthetic organism unlike any on Earth. You repeat
Engelmann's classic experiment using this new organism in place of Spirogyra and find that oxygen-dependent bacteria cluster near the green and yellow portions of the spectrum. What does this tell you?
a. The sun of this new planet emits different wavelengths of light than our own. b. This new organism is using yellow and green light to drive photosynthesis. c. This organism appears green, just like plants on Earth. d. This organism utilizes the most energy-rich photons of the spectrum. e. This new organism is using blue and red light to drive photosynthesis.
A pea plant with red flowers is test crossed; half of the resulting progeny have red flowers, whereas the other half have white flowers. The genotype of the test-crossed parent was
A) RR. B) rr. C) either RR or Rr. D) Rr.