Science / 'R' in science

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

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

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