In which phase of sewage treatment are trickling filters sometimes used?
A. primary treatment.
B. secondary treatment.
C. tertiary treatment.
D. quaternary treatment.
B. secondary treatment.
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Acorn worms, members of the phylum ____, use their mucus-coated proboscis to construct U-shaped burrows to trap
food particles.
a. Hemichordata b. Echinodermata c. Cnidaria d. Arthropoda e. Chordata
If a mutation occurs in a somatic cell that leads to a non-functional protein, what will happen to that somatic cell?
a. It will continue through the cell cycle as normal b. It will prevent the cell from finishing the S phase. c. It will enable the cell to fix the mutation. d. It will prevent the cell from completing the cell cycle.
Dominance, sexual behavior, and territoriality can all be related in song birds. This is because:a
the establishment of a territory by singing tends to reduce conflict. b. the establishment of a territory encourages use of the entire habitat and regulates the size of the breeding area. c. competing species are eliminated. d. only individuals that successfully defend their territory can mate. e. females sing but males do not.
What do we call populations of organisms that are usually near the carrying capacity?
A. K-selected B. Parasites C. Perennials D. r-selected E. Predators