'R' in science

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

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

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