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Explanation:

2. Polygenic ( poly- many) traits are the genetic traits that are governed by several genes. Human height is one such example. Other examples in humans are skin color, eye color, etc.

3. There are 3 alleles responsible for the blood type in humans, which are  

Thus, when both the alleles for A blood type and B blood type are present, both are expressed as A and B antigens on the surface of RBC because of Codominance (Co- together) thus producing AB blood type.

4. The pH of the soil is an environmental factor. Hence, the change of color based on the soil pH is an example of the environment affecting a genetic trait.

b

explanation:

compost can be added to topsoil as a:

pesticide