Which of the following is characteristic of the circulatory system of arthropods?
A) lack of a heart
B) lack of blood
C) lack of blood vessels
D) lack of distinction between blood and interstitial fluid
Answer: D
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Explain what causes the growth ridges found on the shells of bivalves.
What will be an ideal response?
Which biome is characterized by plants whose leaves turn color and drop off in the autumn?
a. coniferous forest b. tundra c. temperate deciduous forest d. tropical rain forest e. chaparral
The great adaptive radiation of hominoids in
the Miocene is attributable to a. the proliferation of complex forests. b. an extended cooling and drying trend. c. the advent of bipedalism. d. the evolution of a large brain. e. changes in tooth structure
The olfactory epithelium is located in the roof of the mouth
____________________ Indicate whether the statement is true or false.