Answer:
The answer should be 'Genes'
Explanation:
Porosity depends on the size, shape, and mixture of grains and particles that compose soil and rock. For instance, small particles such as clays can compact more closely together, reducing the amount of porosity. However, larger particles such as sand and gravel will have more spaces available between them.
Heredity is the passing on of physical or mental characteristics genetically from one generation to another.
