Which of the following statements BEST explains the observation that there are more autism cases now than in the past?
a. There are more parents who neglect their children, which is a cause of autism, now than in the past.
b. Autism has been selected for in recent generations by natural selection.
c. The vaccine for measles, mumps, and rubella has been established as a significant cause of autism.
d. Doctors are more aware of the condition and have better techniques for diagnosing and reporting it.
e. All of the above are equally good explanations for the observation that there are more autism cases now than in the
past.
Ans: d. Doctors are more aware of the condition and have better techniques for diagnosing and reporting it.
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The molluscan class Cephalopoda includes all of the following kinds of animals EXCEPT:
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How does the loop of Henle enable the mammalian kidney to produce hypertonic urine?I-The ascending limb of the loop actively extrudes Na+.II-The descending limb interacts with the ascending limb to raise the osmolarity of the extracellular fluid in the renal medulla.III-The concentration is further enhanced by the presence of urea, which draws water out of the collecting ducts by osmosis.
A. II and III B. just III C. just I D. I and II E. I, II, and III