It has been hypothesized that, if the sun disappeared, all life would end. Other than the obvious drop in temperature, why would humans probably die if the sun suddenly stopped shining?
What will be an ideal response?
Plants provide us with both the oxygen we need for breathing and the energy we need to survive. Plants harvest the energy of the sun and produce sugars that we can eat in order to gain energy.
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Germ layers are
A. layers of cells surrounding the egg prior to fertilization. B. colonial protists arranged in layers. C. layers of gametes. D. layers infected with bacteria. E. embryonic layers with different developmental potentials.
Which of the following would not be secreted across the tubule?
a. ammonium ions b. hydrogen ions c. creatinine d. carbon dioxide e. penicillin
Oceans, the atmosphere, and fossil fuels are large reservoirs of
A) water. B) phosphorus. C) oxygen. D) carbon. E) nitrogen.
How many bases does it take to code for a single amino acid?
A) four B) six C) two D) three E) one