Which of the following might be an investigation of microclimate?

a) the effect of ambient temperature on the onset of caribou migration

b) the seasonal population fluctuation of nurse sharks in coral reef communities

c) competitive interactions among various species of songbirds during spring migration

d) how sunlight intensity affects plant community composition in the zone where a forest transitions into a meadow

D) The sunlight intensity variation affects composition of plant community in zone where a forest transitions into a meadow might be a microclimate investigation.

The microclimate is climate of a small area. These areas include parks, valleys, gardens, etc. Decomposition of decaying carcasses has an influence on soil properties, plant and animal life in the place. Studies conducted in different areas and in varying seasons show that decomposition varied in all conditions.  

Analyzing decomposed animals to determine nutrient recycling is done by analyzing energy and tissue loss; and bone analysis. The humidity, sun and wind temperature affect the decaying process since catalyst microorganism that aid decomposition such as maggots depends on temperature.