Question

which is an example of the progression from cells to systems in a multicellular organism?
the nervous system is made of brain tissues, composed of neural organs consisting of nerve cells.
heart cells form heart tissue, which makes up the heart organ and contributes to the circulatory system.
digestive cells combine to form digestive systems, which organize into digestive tissues and organs.
muscle systems are made of muscle organs made from muscle tissues, which are, in turn, made of muscle cells.

Explanation:

In a multicellular organism, the biological hierarchy is cells → tissues → organs → systems. Let’s analyze each option:

• For the first option, the order “system - tissues - organs - cells” is incorrect.
• The second option follows the correct order: heart cells (cells) → heart tissue (tissue) → heart organ (organ) → circulatory system (system).
• The third option has an incorrect order “cells - systems - tissues - organs”.
• The fourth option has an incorrect order “systems - organs - tissues - cells”.

Answer:

Heart cells form heart tissue, which makes up the heart organ and contributes to the circulatory system.