Define the terms producer, primary consumer, and secondary consumer.
What will be an ideal response?
Producer: a photoautotropic organism.
Primary consumer: an organism that eats producers.
Secondary consumer: an organism that eats primary consumers.
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Which of the following vitamins is water-soluble and cannot be stored in the body?
a. A b. D c. C d. E e. K
Lymphocytes
A. gain tolerance to self by destruction of lymphocytes that could react against self. B. have membrane receptors that recognize foreign antigens. C. possess MHC antigens for recognizing self. D. develop into clones of B and T cells with extreme variations of specificity. E. All of the choices are correct.
Which of these methods of heat transfer is not relevant to biological systems?
A. evaporation B. radiation C. conduction D. reflection E. convection
Suppose scientists discovered an organism that had a head with a brain at the anterior end of the dorsal nerve, eyes and other sensory organs, a skull, and a vertebral column. The organism could not be a/an
A) lamprey.
B) hagfish.
C) ray-finned shark.
D) amphibian.