Answer:
1) Is a the blood travels through the upper half of the body
to the right atrium.
Answer:
In my guess, The union of cells with a similar structure and function is muscular tissue because it is obviously same in shape and all tissue has the similar function I.e. give the structure to the body.
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The elbow is an example of a hinge joint the shoulder is and example of ball and socket joint.
The Retina is a layer in the back of the eye which contain cells that are sensitive to light and trigger nerve impulses to be received by the brain which causes visual images to be formed
