The element neon (Ne) has eight electrons in its outermost electron shell. How many covalent bonds will Ne readily form?
A) 1
B) 2
C) 3
D) none
Ans: D) none
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The epidermis is waterproof and tough due to the activity of ________.
Fill in the blank(s) with the appropriate word(s).
How are hormones produced by endocrine glands typically transported to target cells?
a. in the blood b. through the air c. across a synapse d. via direct contact e. in interstitial fluid
All of the following reasons—except one—explain why so many sperm are ejaculated when only one
is needed for fertilization. Which is the incorrect reason? a. Many sperm die by phagocytosis in the female tract. b. Many sperm swim up the wrong oviduct. c. The enzymes from many acrosomes are needed to penetrate the corona radiata. d. Many male pronuclei must be present in order to fuse with each female pronucleus. e. Many sperm die as a result of the unfavorable pH in the vagina.
At one time it was thought to be impossible to operate within the body cavities. Then the Canadian doctor, William Beaumont, operated on a patient with a gunshot wound to the stomach. A few decades later came breakthroughs in heart operations and transplants. The 1990s was called the decade of the brain because of the extensive research being done on how the brain functions. Name the body cavities associated with these breakthroughs in order.
A. abdominal-dorsal-thoracic. B. abdominal-thoracic-dorsal. C. thoracic-dorsal-abdominal. D. thoracic-abdominal-dorsal. E. dorsal-thoracic-abdominal.