The structures illustrated in the figure are found in the ____
a. mouth
b. esophagus
c. stomach
d. small intestine
e. colon
ANSWER: d
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Four of the five blood cell types listed below share a
common origin. Select the exception. a. neutrophil b. megakaryocyte c. lymphocytes d. monocyte e. basophil
As DDT accumulates in the tissues of carnivores at increasing trophic levels, the concentration increases; this is representative of ________
Fill in the blank(s) with correct word
Speciation, or the formation of new species, is
A) a form of microevolution. B) responsible for the diversity of life. C) necessary for natural selection and adaptation. D) an event that has occurred only a few times in the history of the planet.
Why are modern light microscopes better than the ones Leeuwenhoek used?
A) Modern microscopes have a fivefold better resolution. B) Modern microscopes are compound instead of simple. C) Modern microscopes have lenses with smaller numerical apertures. D) Modern lenses are made of prisms. E) Modern microscopes are compound and have fivefold better resolution.