A hydrogen atom consists of
What will be an ideal response?
proton and electron
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Which of the following statements is true concerning an outgroup?
A. It is the least closely related taxon to any of the other taxa in the tree. B. It is an extinct reference for the rest of the taxa in the tree. C. It is the most recent common ancestor for the other taxa in the tree. D. It is the most closely related taxon to the other taxa in the tree but does not share the most recent common ancestor with the ingroups.
In a population of organisms, beneficial and harmful random mutations are retained or eliminated through the process of:
A) expression B) folding C) selection D) translation E) conservation
Worms with a well-developed circulatory system (including five pairs of hearts) are
A) echinoderms. B) eels. C) nematodes. D) annelids. E) platyhelminths.
A radioactive isotope is an isotope that
A) is stable. B) decays. C) has more protons than the common variant of the element. D) has the same atomic mass but a different atomic number than the common variant of the element.