Earthworms show all of the following features except
A. containing segments with a mouth on the first and the anus on the last.
B. containing touch-sensitive and light-sensitive organs in the segments.
C. containing fewer setae than in polychaetes.
D. containing distinct head regions and parapodia.
E. being hermaphroditic.
D. containing distinct head regions and parapodia.
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Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
What will be an ideal response?
A garter snake attacking a banana slug is an example of ________
a. classical conditioning b. habituation c. a fixed action pattern d. instinctive behavior e. imprinting
Answer the following statements true (T) or false (F)
1. Prokaryotic cells reproduce by forming gametes that will unite in fertilization. 2. Because prokaryotic cells do not go through interphase, mitosis, and cytokinesis, they do not replicate their DNA prior to division. 3. In spermatogenesis there are two divisions in meiosis, resulting in four daughter cells. 4. The number of chromosomes in a daughter cell produced by mitosis is the same as the number of chromosomes in the parent cell. 5. The number of chromosomes in a daughter cell produced by meiosis is the same as the number of chromosomes in the parent cell.
Too much calcium in the bloodstream, a condition called hypercalcemia, can be very dangerous. The thyroid gland releases a hormone, calcitonin, when calcium is too high. How does calcitonin lower calcium levels in the blood?
A) It reduces osteoclast activity and increases osteoblast activity. B) It increases osteoclast activity and reduces osteoblast activity. C) It reduces both osteoclast and osteoblast activity. D) It increases both osteoclast and osteoblast activity.