Here are the main theories of the cell theory.
1. All living organisms are composed of one or more cells.
2. The cell is the basic unit of structure and organization in organisms.
3. Cells arise from pre-existing cells.
cell theory states that the cell is the basic unit of living organisms. Before the discovery of the cell, people were unaware that living organisms were made of building blocks of cells
Answer:
1. It is present as the outermost layer in animal cells and lies below the cell wall in plant cells.
2. The cell membrane surrounds the cytoplasm of living cells, physically separating the intracellular components from the extracellular environment.
3. The cell membrane is semi-permeable, ie, it allows some substances to pass through it and does not allow others.
Explanation: The cell membrane (or plasma membrane) surrounds all living cells, and is the cell's most important organelle. It controls how substances can move in and out of the cell and is responsible for many other properties of the cell as well.The membranes that surround the nucleus and other organelles are almost identical to the cell membrane. Membranes are composed of phospholipids,proteins and carbohydrates arranged in a fluid mosaic structure,
Answer: small protects cell and let's things in
Explanation: because.
Contact forces only work by pushing.
Contact forces only work by pulling.
Contact forces require the physical contact between objects.
Contact forces work between two objects that do not touch.
In physics, a contact force is a force that acts at the point of contact between two objects, in contrast to body forces. Contact forces are described by Newton's laws of motion, as with all other forces in dynamics. Contact force is the force in which an object comes in contact with another object.
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b.Sexual