Which skeletal line structure is the same molecule as the ball-and-stick model below? 
Definitions:
Connective Tissue
Tissue that supports, binds together, and protects organs, including blood, bone, and cartilage.
Blood
A fluid in the bodies of humans and other animals that delivers necessary substances such as nutrients and oxygen to the cells and transports metabolic waste products away.
Evolutionary Constraints
Limitations on the course or outcome of evolutionary changes; these can be due to physical, genetic, or environmental factors.
Circulatory System
The body system responsible for the transport of blood, nutrients, gases, and wastes throughout the body.
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