OSAT Physical Science Practice Test 2025 – Comprehensive All-in-One Guide to Exam Success!

A multi-celled organism is characterized by having specialized cells that are organized into tissues, organs, and organ systems. This level of cellular organization allows for greater complexity in form and function compared to unicellular organisms. In multi-celled organisms, different types of cells perform specific roles, contributing to the overall health and efficiency of the organism. For example, in humans, muscle cells are specialized for contraction, while nerve cells are specialized for transmitting signals. This specialization leads to increased efficiency and allows multi-celled organisms to perform a variety of functions that are essential for survival.

The existence of specialized cells is crucial for processes such as digestion, respiration, and reproduction, which are often handled by different tissues working together in complex structures like organs. This arrangement maximizes the organism’s ability to adapt to its environment and carry out vital biological processes.