'R' in science

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

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

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