Default network
When the brain is unoccupied, an fMRI indicates that blood continues to flow via a web of brain regions called the default network.
The default network is a web of brain regions that have activity that corresponds greatly with each other and different from other networks within the brain. The default network is active when an individual's attention is not concentrated on the external environment and it is measured with the functional magnetic resonance imaging technique (fMRI).
Some unicellular organisms are similar to animals because they have the ability to move.
Third option
Answer:
<em>The sun or solar energy is at the start of almost every energy
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chain.</em>
Explanation:
