A. supply their own light
B. compensate for the lack of light
C. locate food and enemies
D. both b and c
A. long, sensitive feelers
B. luminous fins
C. enormous owl-like eyes
D. no actual eyes
A. evolved more than one means of creating light
B. some power of illumination
C. developed extremely sensitive feelers
D. almost telescopic eyes
A. Where there is no light, the power of illumination is necessary for survival.
B. Food getting is a difficult problem in the ocean depths.
C. All fish in the darkest depths of the ocean have some device to compensate for lack of light.
D. When a fish is being pursued, it often turns off its light.
A. because
B. so
C. but
D. if
A. has lived
B. living
C. lived
D. live
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