'R' in science

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

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

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