'R' in science

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

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

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