All of the following pertain to red tides, except
A. due to overgrowth of toxin-producing dinoflagellates.
B. due to overgrowth of red and brown algae in water.
C. involve toxin concentrating in shellfish.
D. humans can become ill from eating the shellfish.
E. cause paralytic shellfish poisoning.
Answer: B
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Which of the following statements describe advantages that seeds have over spores?
_____ Seeds have tough walls that allow dispersal through the air. _____ Seeds are produced in greater numbers. _____ Seeds are able to store food. _____ Seeds employ various means of dispersal, allowing colonization of more diverse habitats. _____ Production of seeds does not require water as a medium for sperm transport.
In the chemical shorthand 14C, the 14
represents the number of a. excess neutrons. b. protons plus neutrons. c. electrons. d. protons plus electrons. e. radioactive particles
Bacteria that have a spherical shape are called ________
A) coccus B) bacillus C) spirillum D) spheroid
Less-developed countries may be characterized by:
a. low fertility rates. b. high GNI PPPs. c. low doubling times. d. high use of contraception. e. high infant mortality rates