The figure shows a simple worm. Bilateral symmetry and a highly branched gastrovascular cavity all suggest that the worm is a(n) ________. 
Definitions:
Left Atrium
The upper left chamber of the heart that receives oxygen-rich blood from the lungs and pumps it into the left ventricle.
Electrocardiogram
A test that records the electrical activity of the heart over a period of time, used to detect heart abnormalities.
Electrical System
A network of electrical components deployed to distribute, transmit, and utilize electricity effectively across various environments and devices.
Heart's Measure
An informal expression referring to the evaluation or assessment of heart function or health, possibly including heart size, capacity, or performance.
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