What is the key concept addressed by the question?
What will be an ideal response?
The question asks about the configuration of
electrons in an atom.
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During development in the mother's uterus, human embryos have pharyngeal pouches (sometimes called gill slits) that later develop into various glands. Fish also have pharyngeal pouches as embryos, but these develop into gills. The best explanation for why human and fish embryos develop pharyngeal pouches is
A. humans and fish share a common ancestor that had gills. B. human embryos need gill slits to breathe in the uterus. C. humans and fish both develop pharyngeal pouches by random chance. D. fish evolved from humans.
Four of the five answers are correct statements about materials in biogeochemical cycles. Select the exception
a. They pass from environmental reservoirs to living organisms. b. They move slower than elements in living systems move. c. They eventually move from living organisms back into environmental reservoirs. d. They may include rocks and sediments, waters, and atmosphere reservoirs. e. They are unidirectional, moving from the environment to living organisms.
The source of calcitonin is the
a. pituitary gland. b. adrenal cortex. c. adrenal medulla. d. thymus gland. e. thyroid gland.
Describe the process of atherosclerosis and discuss two possible complications for the affected
individual. What will be an ideal response?