Which of the following is heterosporous?
a. whisk fern
b. spike moss
c. horsetail
d. liverwort
e. hornwort
B
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A DNA double helix has two strands that are held together by ____
a. hydrogen bonds b. ionic bonds c. hydrophobic interactions d. phosphodiester bonds e. covalent bonds
________ is the loss of soil under the force of wind and water
a. Phytoremediation b. Decomposition c. Bioremediation d. Soil erosion e. Leaching
Which of the following is false concerning the atom
in the figure? a. The number of protons and the number of electrons are equal. b. It has an atomic mass of 4. c. Electrons are moving around the nucleus. d. It has an atomic number of 2. e. The number of electrons exceeds the number of protons.
Evolutionary history includes mass extinctions that are characterized by the sudden disappearance of a wide variety of species. What is another important consequence of mass extinctions?
a. Mass extinctions create climate changes that lead to further extinctions. b. The number of groups of organisms tends to drop following a mass extinction and then levels off. c. Species remaining after a mass extinction are poorly adapted to their environment. d. Following a mass extinction, there is always a burst of life's diversity. c. Mass extinctions are always followed by a catastrophic event.