Many scientific discoveries begin with direct observations. which could be a direct observation?
a. ants communicate by airborne chemicals
b. birds navigate by using magnetic fields
c. butterflies eat nectar from flowers
d. fish feel vibrations through special sensors
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Transmission electron microscope are best for viewing a) microorganisms in pond water b) internal organs of a mouse c)internal structures of a cell d) surface features of a specimen
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What are the doorways into and out of cells, attached to the membrane, and built in the rough er.
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Which of the follow describes a disadvantage secondary sources have compared to primary sources?
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Many scientific discoveries begin with direct observations. which could be a direct observation?
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