Which of these animals uses positive pressure breathing?
A. reptiles
B. mammals
C. amphibians
D. birds
C. amphibians
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Humans cannot survive at sea by drinking salt water. However, marine vertebrates such as sea turtles and various sea birds can survive by drinking salt water. What do they have that humans do not?
A. kidneys that are extremely good at producing a concentrated urine. B. body fluid concentrations that are similar to or greater than those of seawater. C. the ability to secrete salts and wastes into their intestinal contents like an insect. D. They use ammonia as their primary nitrogenous waste. E. salt glands.
The goal of eugenics is to
a. selectively engineer and change normal human traits into what some perceive to be more desirable characteristics. b. eliminate genetic disorders. c. produce genetically identical humans. d. eliminate genes for abnormal behavior. e. accomplish all of these
Prior to the 19th century, most scholars thought that the world was less than 10,000 years old. Based on geological and radiometric evidence, however, scientists now believe the age of Planet Earth is closer to:
a) 20,000 years old. b) 100,000 years old. c) one million years old. d) 40 million years old. e) four billion years old.
The placental blood vessels
A) manufacture hormones that slow the growth of the embryo, preventing it from outgrowing the uterus. B) allow for the exchange of wastes and nutrients but keep the maternal and fetal circulations separate. C) draw oxygen from the fetal blood and pass it to the mother. D) mix maternal blood and fetal blood. E) prevent all microbes and toxins from crossing from mother to child.