North Atlantic right whales, Eubalaena glacialis, were called "right whales" because they were the best whale for early whalers to kill. They have long baleen and lots of blubber and oil
When killed, they could be towed back to land for processing because they float. They once numbered in the millions, but the entire population of the species is now less than 400. The history of the right whale is an example of A) pollution.
B) overexploitation.
C) habitat destruction.
D) competition.
B
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The stimulation of B cells to divide and mature is provided by
A. T helper cells. B. macrophages. C. T cytotoxic cells. D. plasma cells.
Below is a pedigree of a human genetic disease in which solid color indicates affected individuals. Assume that the disease is caused by a gene that can have the alleles A or a. What is/are the possible genotype(s) of person 3?
A) AA
B) Aa
C) Either AA or Aa
D) aa
E) Cannot be determined
What does sampling error refer to?
A) the difficulty in accurately measuring results that are incalculable B) the differences between a group of experimental subjects and the population as a whole C) the experimental results that do not support the hypothesis being tested D) the intentional biases on the part of researchers
What group has a water vascular system, moves with tube feet, and has an endoskeleton?
A. arachnids B. echinoderms C. crustaceans D. mandibulates