The purple circular structures are the nucleus.
It’s is a product so it is released by the plant
The answer is letter B.) Cartilage
Chondrocytes are cells found primarily in the connective tissue, cartilage. The system of cartilage consisting of large amounts of chondrocytes is called the cartilage matrix.
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I am not sure but here is a link that should help :)
https://www.ncbi.nlm.nih.gov/pubmed/9971764
