I think it’s d.
search it up to make sure
H-H
O//O
For oxygen, draw the lines horizontally
The given blank can be filled with cells.
The extracellular matrix is the protective tissues present as a coating of the cells. Both animals as well as the plant cells have the extracellular matrix, this coating provides support, biochemical protection and mechanical protection from the external environment of the cells. In the plant cells, the cell wall is a type of extracellular matrix.