What are some of the hazards of smoking? What methods might society employ to try to reduce the number of people exposed to secondhand smoke?
What will be an ideal response?
Smoking causes heart disease, chronic bronchitis, emphysema, and lung cancer, among other major health problems. Methods to reduce smoking among the public include education and banning smoking indoors; also, some state governments have raised cigarette taxes considerably.
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The rate of diffusion of molecules would be fastest in a cell with an
A. internal concentration of 45 percent and an external concentration of 50 percent in cold temperatures. B. internal concentration of 50 percent and an external concentration of 12 percent in cold temperatures. C. internal concentration of 50 percent and an external concentration of 12 percent in warm temperatures. D. internal concentration of 40 percent and an external concentration of 35 percent in warm temperatures.
_______ are strains that are unable to grow on a minimal medium that supports growth of the wild type strain, but are able to grow on the minimal medium if one or more nutritional supplements are added.
A. Minitrophs B. Autotrophs C. Prototrophs D. Auxotrophs
The tree in the figure is based on which type of traits, and what is the name of the genus for the most recent horse?
A. Genetic (DNA): Orohippus.
B. Morphological: Equus.
C. Molecular: Equus.
D. Genetic homology: Pliohippus.
E. Morphological: Hyracotherium.
What discoveries in the fossil record led to
questioning the concept that species didn’t change?
a. the oldest layers contain fossils of simpler organisms b. more recent layers contain fossils more similar to existing species c. many fossils were found of extinct animals d. more recent layers contain fossils that are more complex than earlier ones e. all of these are discoveries in the fossil record that led to questioning the concept that species didn’t change