What is the main reason for using food webs instead of food chains in analyzing ecosystems?
I) Most organisms eat more than one type of food.
II) Most organisms feed at several trophic levels.
III) The decomposition cycle needs to be shown.
A) only I
B) only II
C) only III
D) only I and II
E) I, II, and III
Answer: D
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________ is a chemical message sent by another individual.
a. Pheromone
b. Proprioception
c. Thermoception
d. Phenome
Which one of the following characteristics is true of all viruses? (Choose all that apply)
A. They contain a DNA genome. B. They must infect a host cell to reproduce. C. They have a protein coat called a capsid. D. They are surrounded by a lipid envelope.
All of these criteria are used to classify an organism as a member of the plant, animal, or fungi kingdom EXCEPT which one?
A) the organism's life cycle B) the means by which the organism transports itself C) the structure or body plan of the organism D) the mode of nutrition of the organism
Half of the gametes produced by an organism with the genotype Aa will receive the A allele, while half will receive the a allele. What process produces such results?
A) independent assortment B) mutation C) random fertilization D) segregation