The blank is an organ that has an immune function and is found within the close of the intestines​

How are tumors cells different from normal cells

The organelle pictured is found in cells of and is theorized to have once been an independent organism.

Plz will mark! the diagram shows the positions of the sun, moon and earth during spring tides, when the high tides are at their highest and low tides at their lowest. what is it about these positions that causes these high and low tides?