'R' in science

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

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

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