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Robert H. Whittaker

an American biologist, came up with a five-kingdom system for classifying organisms. Those kingdoms are Monera, Protista, Fungi, Plantae and Animalia.

Carolus Linnaeus

Carolus Linnaeus, a Swedish physician and botanist, classified organisms based on similar structures. Linnaeus placed all organism into two main groups, called kingdoms.

Aristotle

Greek philosopher Aristotle lived more than 2,000 years ago. He was one of the first people to classify organisms.

dichotomous key

is a series of descriptions arranged in pairs that lead the user to the identification of an unknown organism

, binomial nomenclature,

gives each organism a two-word scientific name

species

is a group of organisms that have similar traits and are able to produce fertile offspring.

genus

is a group of similar species.

binomial nomenclature

, gives each organism a two-word scientific name

Systematics

is the branch of biology that deals with classification

Classification

is a system of organization based on shared characteristics or qualities.

biodiversity.

The variety of life that can be found on Earth is called biodiversity.

Francesco Redi

an Italian scientist known for his work in experimental biology and for disproving spontaneous generation.

John needham

was an English scientist known for his experiments with microbial life and his support of the idea of spontaneous generation.

Lazzaro Spallananzani

an Italian scientist who conducted experiments to disprove spontaneous generation and demonstrated that microorganisms come from other microorganisms.

louis pasteur

a French chemist and microbiologist renowned for his discoveries in germ theory and pasteurization, which disproved spontaneous generation.

alexander oparin

a Russian biochemist known for his theory on the origin of life, suggesting that life arose from simple organic compounds in a primordial soup.