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Browse the glossary using this index

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P

pathogen

organism which causes disease

penicillin

first antibiotic, discovered by Sir Alexander Fleming

Periodic Table

the table showing all the elements

Physical

properties concerning changes that do not involve the formation of a new substance

Pitch

how high or low a sound is

Plant kingdom

group of living things which make their food using chlorophyll

Plasma

fluid part of the blood which carries everything apart from oxygen around the body

Population size

number of individuals in a species in a specific area at a specific time

Porous

a rock with spaces between the grains

Predators

an animal which hunts other animals for food

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