Answer:
Humus is formed when organic material (such as leaves, dead animals etc.) is degraded by a combination of fungi, bacteria, microbes and other animals (earthworms for example) that reside in the soil.
Explanation:
C.
In co-dominance both traits show up, and in incomplete dominance the two traits mix together.
So automatically A, B and D are wrong, since we can see both brown and white colors on the cow separately.
If it were any of those we wouldn't be able to see any of the traits alone they would be a mix.
Genes are segments of DNA which form chromosomes. Chromosomes are segments of DNA.