99) density-dependent factors include factors such as while density-independent factors include factors such as

a) temperature; floods
c) disease; parasites
d) competition; storms

D) competition; storms

Density-dependent factor includes competition. The higher the number of population is the higher competitiveness blends in.
In contrast, storms are density-independent. Despite the population growth, storms are innate in itself as natural calamities regardless of population growth
 or decline. 

Ithink the answer is d.

Search on internet it may you