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

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