Which animal is a suspension feeder?
a. fish
b. sea stars
c. sponges
d. lobsters
e. sea urchin
c
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The planting of strips of trees and shrubs along the edges of plowed fields is used to
A) decrease wind erosion. B) form water catchments for irrigation and wildlife conservation. C) drain off excess water during heavy rainfall events. D) limit the spread of crop pests.
Which of the following is associated with the quaternary structure of proteins?
A) the sequence of amino acids B) hydrogen bonding within the backbone C) hydrogen bonding between the side chains D) the interaction of protein subunits
Windblown loess, like sand, typically accumulates as mound-like dunes
Indicate whether the statement is true or false
Researchers in Switzerland and Pennsylvania have demonstrated that organic farming ________
A) suppresses the biodiversity of pollinating insects, especially bees B) increases the incidence of invasive species C) is only sustainable with pesticides and synthetic fertilizers D) presently has no market in Europe E) decreased organic soil losses while giving yields almost as high as conventional farming