Arthritis is a condition in which
1.Bones are unusually fragile and break easily.
2.The bone marrow does not develop properly.
3.There is an inflammation of the joints.
4.The epiphyses do not permit growth.
5.Tendons are stretched.
3
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Four of the five stimuli listed below are sign stimuli. Select the exception
a. a smiling human face b. the red spot on the beak of a herring gull c. the open mouth of a peeping baby bird d. a red-colored stimulus that triggers a territorial red-bellied stickleback fish to attack it e. a mother rat picking up young rats and returning them to the nest
The concept of an ecosystem differs from that
of a community in that, unlike the community, the ecosystem includes the a. producers. b. decomposers. c. physical environmental factors. d. animals as well as the plants. e. parasites.
Compared to C3 plants, C4 plants _____
A) can continue to fix CO2 even at lower CO2 concentrations and higher oxygen concentrations B) have higher rates of photorespiration C) do not use rubisco for carbon fixation D) make a four-carbon compound, oxaloacetate, which is then delivered to the citric acid cycle in mitochondria
Mollusks have all of the following EXCEPT
A. larvae. B. foot. C. mantle. D. tube feet.