'P' in Natural Sciences

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

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

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