Answer:
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Human activities in the united states such as burning fossil fuels for electricity, heat, and certain transportation.
hope this helps :)
<span>the type of connective tissue that he's observing is : cartilage tissue
Chondrocytes are made mostly by collagen.
The collagen caused a smooth and elastic tissue which is very rubber-like, which could be used to protect the long bones of our joints, which commonly found in cartilage tissue</span>
