13. Which of the following terms describes physical traits which are influenced by both genes and the environment? a. Polygenetic b. Dominant-Recessive c. Epifactorial d. Multifactorial

option D is correct one.

Explanation:

multifactorial means many factor which are involved in health problem.this factor are combination of genetic and environmental. combination of genes one get from parents and environmental factor make this type of trait and condition.

one great example of multifactotial trait is height.some cancer cluster in family  as a result of genetic and share environmental factor.

from my research i have to the conclusion that decomposers, such as fungi, bacteria and invertebrates, play a critical role in nutrient cycling and without them the earth's ecosystem may not support life as we know it. elements such as carbon, nitrogen and phosphorus exist in limited amounts on earth, although huge amounts of carbon are being released into the atmosphere from underground sources now by humans. it is still extremely important that other nutrients be retained by the process of re-use. decomposers are organisms that are able to chemically break down dead material and make these elements available for use by other organisms. without this breakdown of dead material, dead bodies would pile up. so decomposers also play a role in clean up also. without them, life might not continue as we know it and dead material would overwhelm the earth.