No one knows yet how the first cell came about.
Matthias Schleiden first observed plant cells, or at least first came up with a part of cell theory including cells.
No it just states cells are the basic building blocks of life, that all things are made of cells and that all cells came from other cells.
Rudolph Virchow came up with the third part of cell theory: all cells come from other cells, whereas Schwann and Schleiden came up with the other two parts.
A parent cell, also known as mother cell, is the origin of other cells. It is a cell that splits to make two or more daughter cells. A parent cell can be the first stem cell in a line of expanding cells.
They allow Cells to communicate with other Cells.
One cell is one cell, no matter where it came from.
New cells are formed from other cells. Cells replicate. The new cells that are created have the same material in them as the cell it came from.
Cells produced by mitosis simply duplicate themselves, so they will always be identical to the cell they came from.
Meiosis happens in the reproductive cells. After the first division you get 2 cells with 46 chromosomes, after the second division, you get 4 cells with 23 chromosomes. In humans at least. These cells will become the sperm cells in males. In females, only one cell of 23 chromosomes becomes an egg, the other 3 are called polar bodies and are reabsorbed into the body basically.
Again, Cell. It's already been mentioned in other same questions.
Cells come from other cells. However they are not made of cells. They are made of organelles and cytoplasm.
The cell that helps to direct the activities of all the other cells during the immune response is the white blood cell. It attacks the virus or bacteria first.