Which factor is NOT characteristic of a city primarily plagued by photochemical smog?
a. high concentration of sulfur oxides
b. high concentration of nitrogen oxides
c. significant amounts of PANs
d. large numbers of internal combustion engines
e. occasional thermal inversions
A
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Genomics analysis of recently isolated viruses indicate some viruses contain larger genomes than the some bacterial genomes
Indicate whether the statement is true or false.
A vascular bundle
A. contains xylem and phloem. B. is not found in leaves. C. is usually scattered in the stem of a eudicot. D. is on the outer surface of a root. E. is very distinct in the apical meristem.
George Flint is visiting the urologist today for complaints of urinary discomfort and generally not feeling well for quite some time. The doctor has ordered a test on Mr. Flint’s urine and has requested a sterile specimen. The assistant will introduce a flexible hollow tube through Mr. Flint’s urethra into the bladder to remove a sample of urine. This procedure is called .
Male guppies are known for their bright colors. Having bright colors attracts mates, but it also attracts predators. So in an environment with a lot of predators, male guppies have more dull colors. In an experiment, guppies were removed from an area
with predators to an area without predators. Over a period of 12 months the population became much more colorful. This is an example of a response to: A) disruptive selection. B) mutation. C) directional selection. D) stabilizing selection.