HELP PLEASE!! ' Which resource is sometimes unpredictable in terms of energy production?

coal
wood
gasoline
natural gas

Name the type of chemical that speeds up digestion

What is responsible for the uneven heating between the poles and the equator on any given day

Grasses--> mice--> cats--> coyotes suppose 10,000 units of energy are available at the level of the grasses. what is the total number of energy units lost by the time energy reaches the coyote?