Which of the following elements is least abundant in living organisms?
(a) sulfur
(b) carbon
(c) oxygen
(d) nitrogen
(a) Sulfur is the least abundant element among the choices given.
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Our sense of "fullness" after a big meal is due to
A. chemoreceptors. B. electromagnetic receptors. C. stretch receptors. D. thermoreceptors.
During the first meiotic division
A) spermatogonia and oogonia form. B) homologous chromosome pairs separate. C) homologous chromosome pairs join. D) the cell becomes diploid.
In a series of field experiments, David Tilman and colleagues investigated biodiversity and ecosystem function. They found a relationship between
A. ecosystem diversity and genetic diversity. B. species diversity and genetic diversity. C. ecosystem diversity and species richness. D. species diversity and ecosystem function.
Blood flows from the left ventricle into the pulmonary artery. Indicate whether the statement is true or false