Any circle that runs east and west around the earth

The eruption of a nearby volcano causes a prairie ecosystem to receive a lot less sunlight.which of these is the most likely effect on the ecosystem? a-an increase in biodiversity. b-an increase in immigration to the area. c-a decrease in available water. d-a decrease in plant growth.

If animal agriculture was eliminated, how much grain would become available for human consumption?

Coral have a symbiotic relationship with what in order to eat?