Why is it sometimes a disadvantage to take aspirin to reduce a fever?
A) Aspirin makes you irritable and fatigued.
B) Aspirin reduces the fever and stimulates a dangerous inflammatory response.
C) Aspirin reduces the production of toxins so that you feel better, even though you are still sick and need to rest.
D) Aspirin reduces the fever and therefore decreases the activity of phagocytic white blood cells.
D
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A scientist is studying a population of crickets and finds that there is variation in the songs used by males to call for mates. Some males call with high pitched 3 chirp songs and some call with low pitched 4 chirp songs. However offspring from the two types of males are able to interbreed so the scientist classifies the population as a single cricket species and goes on to another project. One year later a mutation arises in a female cricket that makes her unable to hear high frequencies. Ten years later a graduate student returns to the same cricket population and discovers that there are now two distinct cricket species in the area although they appear morphologically identical. What is the most likely explanation?
A. Temporal isolation has led to allopatric speciation. B. Sexual selection has led to sympatric speciation. C. Habitat isolation has led to allopatric speciation. D. Mechanical isolation has led to sympatric speciation. E. Gametic isolation has led to sympatric speciation.
Leeches and earthworms belong to the phylum containing the
A. annelids. B. nematodes. C. sponges. D. flatworms. E. mollusks.
In insects and spiders, __________ take up fluid, uric acid, and solutes from the blood and deliver
them to the gut. Fill in the blank(s) with the appropriate word(s).
Attribute one of these statements to the blastopore.
A. it occurs in both protostomes and deuterostomes. B. it can develop into the gut in some animals. C. it can develop into the brain in some animals. D. it is the opening from the archenteron to the coelom. E. it is the opening from the coelom to the outside of the animal.