Research on speciation of Hawaiian crickets, shown in the accompanying figure, has led researchers to conclude that ________
A) these cricket species have diverged by a mechanism known as assortative mating
B) females of different species have strong preferences for the singing pulse rate of the males of their own species
C) female preference for male singing pulse rate is genetically linked to the combination of genes regulating the singing pulse rate of males
D) All of the above are accurate.
D
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Which of the following is a difference between a viroid and a virus?
A. Viroids are alive and viruses are not. B. Viroids are composed solely of nucleic acid while viruses are composed of nucleic acid surrounded by a protein coat. C. Viroids are not infectious particles and viruses often cause disease. D. Viroids infect only plants while viruses infect only animals and prokaryotes. E. Viroids contain some genes important for their own replication while viruses rely entirely on host cell enzymes for their replication.
When a group of cells works together for a common function, such as in a tissue, they must have a network to communicate with each other. What is that network called?
When a person is having a heart attack, the pain originating in the heart muscle is often felt in the left shoulder and arm. This is called
A. Muscle pain B. Referred pain C. Deep pain D. Acute pain
Which tool technology is possibly associated with Australopithecus garhi?
A. Mousterian B. Chatelperronian C. Acheulian D. Oldowan E. Aurignacian