Gravitational is only attracted and electromagnetic is both atrractive and repulsive since it depends what you are talking about
The answer is diffusion
The process of diffusion requires a membrane that has pores to allow for gas and liquids to pass through.
Answer:
Well they grow up to a certain limit, so they divide into smaller cells. they do that because if the cell grows really big and it would be more difficult to get sufficient amounts of oxygen and nutrients in and waste products out, so the cell has to stop growing before this happens.
Explanation:
Nucleic acids: Nucleotides
Proteins: Amino Acids
Trig-Lypids: Glycerin, fatty acids.
Carbohydrates: Simple sugars.
