Which statement describes a positive effect of a drought in a savanna ecosystem? a) The leaves of the grasses dry up without enough water.
b) Dried leaves catch fire and cause wildfires.
c) Animals that eat leaves die from lack of food and water.
d) The decaying remains of organisms add nutrients to the soil.

Afarmer who is grown corn for the past five years notices in the sixth year that the his harvest is significantly smaller, despite an increase in labor on the farm. the following year, the harvest continue to decline. which of the following explanations most plausibly accounts for the reduction in corn yield? a) soil degradation b) desalinization c) better irrigationd) terracing