How long ago did Neanderthals go extinct?
a. 30,000 years ago.
b. 100,000 years ago.
c. 500,000 years ago.
d. 1 000,000 years ago.
e. 2,000,000 years ago.
A
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It is notoriously difficult to perform unbiased studies when human subjects are used. When governmental agencies such as the U.S
Food and Drug Administration (FDA) are trying to determine the validity of scientific claims, they very closely examine the methods used in the experiments. What are the three phases of clinical trial, and which one(s) must a drug pass in order to be sold in U.S. markets?
Which of the following is/are used for osmoregulation and excretion in all but the simplest animals?
a. modifications of the respiratory and digestive systems b. the lining of the digestive tract c. the transport epithelium d. specialized blood vessels
The release of excess nitrogen into the environment when certain complex organic substrates are used to make new microbial biomass is called ________.
A. mineralization B. dissimilation C. nitrification D. denitrification
Which of the following genetic notations refers to a dikaryotic fungal stage?
A. n + n B. 2n + 2n C. n D. 2n + n E. 2n