What global climatic change gave gymnosperms an advantage over ferns?
A) the climate becoming hotter and wetter
B) increased fluctuations in global climate temperatures
C) the climate becoming cooler and drier
D) the climate becoming hotter and drier
C
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Which of the following best describes cnidarians?
A) They are asymmetrical and have tissues and stinging cells. B) They have radial body symmetry, lack tissues, but have stinging cells. C) They have radial body symmetry, tissues, and stinging cells. D) They have radial body symmetry and tissues but lack stinging cells.
Why do plants containing nitrogen-fixing bacteria in their roots need less nitrogen-based fertilizer than others?
A) The plants break down the bacteria as a source of nitrogen-rich nutrients. B) The bacteria convert nitrogen in the air into a form that can be taken up by the plants. C) The plants and bacteria work together to attract birds, which deposit nitrogen-rich droppings near the plant. D) The bacteria kill and digest earthworms and other animals in the soil, providing excess nitrogen to the plants.
The large, ancient land mass that contained all the continents is known as ____.
A. Laurasia B. Pangea C. Gondwana D. Atlantis E. Europa
Choose the letter of the best match from the following:A. birth control pillB. intrauterine deviceC. diaphragmD. foams and jelliesE. vasectomySperm destruction.
Fill in the blank(s) with the appropriate word(s).