Which of the following is used to calculate maximal exercise heart rate?
What will be an ideal response?
206.9 - (0.67 X age)
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Cytokine signaling of phagocytes is an example of:
A. autocrine signaling. B. endocrine signaling. C. paracrine signaling. D. juxtacrine signaling.
Which of the following is true of plant cells?
A) Plant cells may contain chloroplasts. B) Plant cells are always much larger than animal cells. C) Chromosomes are found only in plant cells. D) Only plant cells have a cell membrane. E) The plant cell has no cell wall.
Olfactory receptors are used for:
a. sight b. sound c. smell d. taste e. touch
The eastern meadowlark and the western meadowlark are two bird species that look very similar to each other. Why do biologists not consider them the same species?
A. The two species experience the reproductive barrier of habitat isolation. B. Species are not determined by appearance but by their ability to interbreed naturally. C. The two species do not live in the same habitat and thus do not interbreed in nature. D. All of the above are correct.