Label or a placard colored black and white with a skull and crossbones falls under which class

The correct answer is class-6 toxic and infectious components.

Explanation:

A placard or a label colored black and white with a skull and crossbones comes under class-6 health hazards. The class-6 is further sub differential into two categories, that is, class 6.1 and class 6.2.  

Class 6.1 signifies toxic substances, which possess the tendencies to cause serious injury or death or harm human health is inhaled or swallowed or coming in contact with skin.  

Class 6.2 comprises infectious substances, which are anticipated to constitute pathogens. The pathogens are illustrated as microbes that can result in diseases in animals or humans.  

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.    

c. would be the answer : )

explanation: