A species of caterpillar develops toxic spikes that deter the birds that prey on it. Over time, the genetics of the bird population shifts so that an allele for a digestive enzyme that neutralizes the toxin becomes more common
This is an example of
A) mutualism.
B) an invasive species.
C) parasitism.
D) coevolution.
E) mimicry.
D
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Which latitude will have the most hours of daylight on the summer solstice?
a. 0º (the equator) b. 30º north c. 45º north d. 60º north
The majority of working American farmers are over what age?
A. 30 B. 40 C. 45 D. 50 E. 60
Which of these events is an example of indirect contact transmission?
A) A person develops plague from a flea bite. B) Vacationers develop shigellosis, caused by the intestinal pathogen Shigella spp., after drinking contaminated water. C) Tuberculosis is spread from one person to another after traveling through the air for several meters. D) A person drinks from a cup used by another individual. E) Several people become infected with Listeria after consuming contaminated ice cream.
Unsaturated fatty acids:
A) are usually found in animal fats. B) have long been linked with heart disease. C) contain the maximum number of hydrogen atoms possible. D) have one or more double bonds between the carbons.