Which of the following movements is a good example of abduction?
A) opening the mouth
B) turning the hand palm upward
C) extreme bending of the head backwards
D) moving the hand toward the shoulder
E) spreading the fingers
E
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Active bone marrow is red because of the presence of ________ whereas inactive marrow is ________ because of an abundance of adipocytes.
Fill in the blank(s) with the appropriate word(s).
Define autoclave
What will be an ideal response?
Which of the following is not a component of saliva?
a. amylase b. mucus c. pepsin d. lysozyme e. water
The concentration of oxygen in the atmosphere is currently 21 percent, but it has been both higher and lower during the Phanerozoic
At the start of the Permian it reached a maximum of 30 percent to 32 percent and then declined throughout the Permian and Triassic, reaching its minimum of 13 percent to 15 percent at the end of the Triassic. Dinosaurs and mammals both appeared in the Triassic, but dinosaurs flourished and radiated into a variety of large-bodied lineages, whereas mammals remained small and did not radiate into multiple lineages. Recall the characteristics of the respiratory systems of sauropsids and synapsids described in Chapter 11 to explain how the low concentration of atmospheric oxygen in the Permian may have favored the development of dinosaurs over mammals.