'R' in science

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

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

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