The central nervous system includes
a. the brain.
b. the spinal cord.
c. nearly all interneurons.
d. all of these.
e. the brain and the spinal cord only.
D
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Alkaloids are considered "expensive" defense compounds to produce because:
A. they contain a lot of carbon, which is costly for plants to concentrate. B. they vaporize readily, so they constantly have to be synthesized. C. they contain nitrogen, an essential and often limiting element plants need. D. they often function in very small concentrations. E. they contain proteins, which are very costly for a plant to produce.
Components of nucleotides are, and how are they connected?
What will be an ideal response?
Which of the following is within the range of heat escaping from the surface of Earth?
a. infrared radiation b. gamma rays c. UV radiation d. X-rays
Which lineage do salamanders belong to?
a. Gymnophiona b. Aves c. Urodela d. Anura