What is misleading about commercials that show "scientific proof" that laundry detergent X is better than another leading brand?
A) We are shown only one tee-shirt becoming whiter in each detergent, not 20 tee-shirts in each detergent.
B) We do not know whether the same amount of each detergent was used for washing.
C) We do not know if everything besides the detergents was the same (machine used, type of stains, etc.).
D) All of the above are aspects that are misleading.
D
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A person with blood group A has both A and B type antibodies
a. True b. False
Carriers of cystic fibrosis have some protection against intestinal infections such as cholera. However, people with two copies of the cystic fibrosis allele develop a life-threatening disease. The mutant allele is very common in people of northern European descent because of
A. disruptive selection. B. directional selection. C. artificial selection. D. sexual selection. E. stabilizing selection.
Which extinct hominin first appeared about 1.9 million years ago and had a larger brain than Homo habilis, its immediate predecessor?
A) Homo ergaster B) Homo neanderthalensis C) Homo sapiens D) Australopithecus
Which of the following statements about mammalian circulatory systems is false?
A) The pulmonary circuit carries blood between the heart and the lungs. B) The systemic circuit carries blood between the heart and the rest of the body. C) Mammals have two atria and two ventricles in their hearts. D) The left side of a mammal's heart sends blood to the lungs.