Answer:
osmosis? I hope I'm right
Answer (option c):
Placer mining involves <u>dredging sediments from the water bottom</u> to extract minerals.
B. It is rigid it is important becuase it keeps the plants structure and it allows the plant to stand upright.
It is not a fluid and because it is rigid it does not stretch.
It cannot be C. because the cell wall is made of cellulose and it is a non living maerial therefore it cannot be alive
<span>The cell membrane acts as a selective, partially permeable boundary which allows wanted substances to move into the cell and unwanted substances to be kept out. Moreover, cell membranes contain surface antigens, which allow the cells to be identified as "self" by the immune system. The cell membrane does not contain hereditary material.</span>
