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Science by Picture - I

Can you name these scientific people, things, and concepts beginning with the letter I?
Quiz by WolfCam
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Last updated: July 15, 2019
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First submittedJuly 15, 2019
Times taken420
Average score60.0%
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reptile
shape
Body Part
Isosceles Triangle
simple machine
geographic feature
extinct creature
concept
element
wavelength
class
organs
type of atom
lines
element
landform
+2
Level 76
Jan 20, 2020
I'd hardly call an inclined plane a machine.
+1
Level 67
Dec 20, 2023
The "simple machine" is a pre-existing concept, not a clue made up for this quiz (usually a list of six: the lever, the pulley, the screw, the wedge, the wheel and axel, and the inclined plane). The inclined plane has been called one of the simple machines since the 1500s according to Wikipedia.
+1
Level 82
Jan 31, 2022
I tried incline without success.