'P' in Natural Sciences

Can you provide these answers about natural sciences that all begin with the letter 'P'?

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Second largest dwarf planet, discovered in 1930 by Clyde Tombaugh
Ground or soil at or below the freezing point of water for two or more years
Unit of distance used in astronomy, equal to about 3.26 light years
Scientific theory describing the large-scale movements of the Earth's crust
Element in the alkali metal group, with symbol K
Russian physiologist known for his classical conditioning experiments with dogs
A semiaquatic egg-laying mammal endemic to eastern Australia
Microscopic organisms, such as diatoms or protozoans, which drift or float in seas or fresh water
An ionized state that is one of the four fundamental states of matter
Quantum of light and all other forms of electromagnetic radiation
American chemist who is the only person to have won two unshared Nobel Prizes
A plant that lives for more than two years, returning to bloom after winter
Antiparticle of an electron
In anatomy, the bone that covers and protects the anterior articular surface of the knee joint
Insect in the non-feeding transformation stage between larva and adult
A genus of constricting snakes whose species include Reticulated and Ball
An organism which kills and eats prey organisms
Study of life of the geologic past, involving analysis of fossils
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Last Updated: Apr 9, 2019

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