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What three groups did Aristotle use to group animals?
Aristotle grouped animals into three categories based on their modes of reproduction: 1) viviparous animals that give birth to live young, 2) oviparous animals that lay eggs, and 3) ovoviviparous animals that produce eggs that hatch within the body.
How did Aristotle classified animals on the basis of?
Aristotle classified animals based on their locomotion abilities. He categorized them into animals with blood (vertebrates) and animals without blood (invertebrates). Within these groups, he further classified animals based on their characteristics and behaviors.
What pumps blood in earthworms?
In earthworms, blood is pumped by a muscular blood vessel called the dorsal blood vessel. This vessel runs along the top side of the digestive tract and contracts rhythmically to circulate the blood throughout the worm's body.
What is the smallest formed element in the blood?
Thrombocytes are the smallest formed elements in the blood. In my Medical Terminology book, it says "The smallet formed elements found in blood are platelets. Although they are sometimes called thrombocytes, they are not true cells, as the term erroneously suggests, but merely fragments of cells."
How many groups did Aristotle use to classify organisms?
Aristotle divided living things into plants and animals and then subdivided animals into land, water and air. He subdivided plants into small, medium, and large. This caused problem because some animals traveled by walking, swimming and flying.
