They classified organisms and species.

Meaning: This means that people arranged or grouped living things according to a system, and the groups of organisms that can reproduce with each other.

Choice of Words: They refers to the people who studied life. Classified means to arrange or group things according to a system. Organisms are living things. And is a conjunction used to connect words, phrases, or clauses. Species are groups of organisms that can reproduce with each other.

Alternative Expressions

Related Expressions

• Whales are endangered species due to hunting and pollution.
• Cheetah is an endangered species.
• Save the species.
• Kangaroos endangered species.
• New species.
• They laughed together as they played hide-and-seek.
• They played until they were tired and cold.
• They laughed happily as they played hide-and-seek.
• They laughed and giggled as they ran around.
• They laughed and talked as they walked hand in hand.