'R' in science

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Can you name the R's in these science questions?

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The most common food source on the planet
A fractional value representing the ratio of the relative speeds of objects before and after a collision.
A part of a longitudinal wave in which the density of the particles of the medium is less than the normal density.
The element responsible for Curie's death.
When the frequency of an external force matches the natural frequency of the body then the body oscillates with large amplitude.
From latin 'stiiffness of death'
The most common viral infectant of the human common cold
The gaining of electrons
A mammal which primarily digests plant based foods.
A measure of how strongly a substance opposes the flow of current
Another name is equilateral quadrilateral
A kind of inflammation of the joints.
Physicist widely credited with first 'splitting the atom' in 1917
An evolutionary grade of animals, comprising today's turtles, crocodilians, snakes, lizards, and tuatara,
A distillation technique involving the condensation and return of vapours
A disease commonly associated with dogs and bats
Element with atomic number 45
A type of surface acoustic wave that travels on solids
A wave whose height is more than twice the mean of the largest third of waves in a wave record
Organelle associated with protein synthesis

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