Organs.
Multicellular creatures' bodies are divided into many types of groups. The intricacy of these ranges will rise. The organelles are composed of macromolecules. The cell is made up of several organelles.
An organ is made up of a collection of similar cells in one specific region. For instance, there are several cells in the middle. The organs system is a collection of organs that cooperate to carry out a certain function within the body.
For instance, the circulatory system of the past was composed of a number of interconnected organs, including the heart and blood arteries, which carried out the function of moving blood throughout the body. It is a system of organs as a result.
Here's another question with an answer similar to this about circulatory system of a whale: https://brainly.com/question/14436548
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