Which factor is ultimately responsible for the rapid population explosion of humans?
A. More prevalence of microorganisms to fight diseases naturally
B. Increasing availability of natural resources
C. Decreasing migration of human and animal populations
D. Decline in death rates without an equivalent decline in birth rates
E. Advances in reproductive technology
Answer: D
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In all of the following characteristics, prokaryotes differ from eukaryotes except in
A. cell size. B. multicellularity. C. chromosomes. D. nucleic acids as the hereditary material. E. organelles.
Stomata open when ________
a. solute concentration inside guard cells is low b. guard cells swell c. water is scarce d. guard cells shrink
Oxygen and carbon dioxide both have the ability to bind to hemoglobin, which would seem to be an unfavorable situation for the body, particularly in terms of cellular respiration
What features does the human body use to favor oxygen and not carbon dioxide binding to hemoglobin?
Which of the following occurs in the placenta?
A) Eroding blood vessels in the endometrium bathe chorionic villi in pools of maternal blood. B) Hormones are absorbed to prevent them from influencing the developing fetus. C) Fetal blood and maternal blood mix. D) All substances in maternal blood that may be harmful to the fetus are prevented from moving across the walls of the villi. E) The amnion and the chorion grow into the endometrium.