Answer:
B.
Explanation:
Macrophages are specialized cells involved in the detection, phagocytosis and destruction of bacteria and other harmful organisms. In addition, they can also present antigens to T cells and initiate inflammation by releasing molecules (known as cytokines) that activate other cells.
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Answer:
Question 26.
B. deposition
Question 21.
Erosion is a destructive force because they disassemble landforms and ultimately destroy the features. Kind of like cultural traits/aspects being diminished. Whereas, deposition is a constructive force because the depositing of sediments can literally form entire landforms- like sand dunes. It takes bits by bits or sediment by sediment to build an entire structure.
The cell membrane of the cell works as a system boundary. It controls what can enter of leave the cell.