The primary function of the plasma membrane is to protect the cell from its surroundings. Composed of a phospholipid bilayer with embedded proteins, the plasma membrane is selectively permeable to ions and organic molecules and regulates the movement of substances in and out of cells.
The Punnett square is a diagram used to predict the result of a breeding experiment through analysing predictable traits which will be passed on genetically by each organism. This diagram helps to identify the probability of an offspring having specific genotypes and characteristics after the breeding process. This is determined by placing the parent genotypes into the diagram and crossing them.
Homeostasis is reaching an equilibrium in an organism. Everything is being maintained properly.
The answer that is not caused by a gravitational pull is two atoms come together to form a molecule because atoms form molecules because of the electrons, and not gravitational pull.
Therefore the correct answer would be,
Two atoms come together to form a molecule.
I hope that this has satisfied you.
