A fluid-filled body cavity completely lined with mesoderm tissue, found in many complex animals. It provides space for organ development and allows organs to move independently of the body wall.
From Greek 'koiloma' meaning 'cavity' or 'hollow.' The term was introduced in the late 19th century by German embryologist Oscar Hertwig as scientists studied the development of body cavities in different animal groups.
Having a coelom was revolutionary because it allowed organs to specialize and move independently! Your heart can beat and your intestines can churn without interfering with each other because they're suspended in this fluid-filled space rather than packed tightly together.
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