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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What wide-acting pituitary hormone targets cells throughout the body?

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