1. Hypoxia is an illness caused by a deficiency of oxygen in
the tissues of the body.
2. A porcupine is a large climbing animal that is covered
with sharp spines for defense.
3. The atom is the smallest part of a chemical that can exist
and still have the properties of the element.
4. A meteorite is a falling star that reaches the earth
without burning up.
5. Chowder is a fish soup usually made with milk.
6. When some or all of the water is removed from milk,
the product is called concentrated milk.
7. Food fallacies are beliefs about food that are not true.
8. Preservatives are chemicals which keep food fresh.
They are often used in potato chips, breakfast cereals,
and oils.
9. Some people are vegetarians. They do not eat meat.
10.One type of vigorous exercise is calisthenics. These are
simple gymnastic exercise which improve physical fitness
11.The coelacanth, a large-bodied hollow-spined fish, was
thought to be extinct until recently.
12.Pacemeaker, a small electrical devices that stimulate
the heartmuscle, have saved many lives.
13.Morse code, a system of telegraphic signals composed
of dots and dashes, was invented by Samuel F.B. Morse.
14.Studying of supernova, the catastrophic explosions of
dying stars, may give answers to questions of modern
cosmology.
15.An antenna, a tall metal object connecting a transmitter
to the ground, increases the distance a radio signal
travels.
16.A radio broadcast transmitter has a carrier wave which
is a basic, continuous transmission of energy.
17.When the carrier wave is carrying information, the side
bands which are the frequencies immediately above and
below the carrier become involved.
18.Multiplexing, the transmission of independent signals at
the same time in the same channels, increases the
efficiency of radio channels.
19.Early records were made of shellac, a thick, heavy
material which breaks easily.
20.The only way inventors can protect their work is by
obtaining patents which assure them that they have the
right to make, use, and sell their inventions.
21.Although our teacher tried to clarify the problem for us,