Why are Sunlight and nutrient levels asexual

Sexual reproduction allows them to produce fit offspring that can survive under stressed environmental condition

Explanation:Reproducing sexually and asexually allows fungi to adjust as per the environmental condition.  

When the conditions are favorable, they reproduce asexually and increase their number but when the condition are not favorable and environmental selective pressure occur then they undergo genetic variation through sexual reproduction to produce a stable and fit offspring that could survive under stressed condition with limited resources.

Asexual reproduction Since there are plenty of resources, the plant will want to reproduce quickly and colonize the area

his research revealed two genetically different groups of prokaryotes, which justified splitting kingdom monera into two kingdoms. the genetic and cellular differences were so great, that these two kingdoms were eventually placed into different domains in the current three-domain system.

the answer is:

carbon dioxide