Polychlorinated biphenyls (PCBs) are toxic chemicals that were widely used in manufacturing until they were banned in the U.S. in 1977. PCBs are very persistent in the environment and bind strongly to sediments, meaning that bottom dwelling and filter feeding organisms are likely to take in PCBs as they feed. PCBs accumulate in the fatty tissues and, to a lesser extent, muscle tissues of organisms. Examine the food web below. Which species do you predict would have the highest concentration of PCBs in their tissues?
A. shrimp
B. mussels
C. seal
D. heron
E. salmon
C. seal
Biology & Microbiology
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a. adrenocorticotropic hormone b. thyroid-stimulating hormone c. gonadotropin d. growth hormone e. prolactin
Biology & Microbiology
The nervous system of vertebrates has how
many divisions?
a. 1 b. 2 c. 3 d. 4 e. variable, depending on the animal
Biology & Microbiology
Surface tension is an example of ____
a. hydrophobicity b. concentration c. evaporation d. cohesion e. polarity
Biology & Microbiology
Explain why Mendel choose seven different varieties of pea plants for his experiments. What will be an ideal response?
Biology & Microbiology