Author Question: Some plastics accumulate poisons such as DDT and PCBs to levels as high as a ________ times their ... (Read 74 times)

panfilo · **on:** Aug 22, 2018

Some plastics accumulate poisons such as DDT and PCBs to levels as high as a ________ times their concentrations in seawater.

A) fifty
B) one hundred
C) one thousand
D) one million
E) one billion

Question 2

Two dominant organisms of the rocky shore found high on the rocks of the intertidal zone are ________.

A) buckshot barnacles and limpets
B) goose barnacles and mussels
C) keyhole limpets and Irish moss
D) periwinkle snails and kelp
E) sea anemones and hermit crabs