Biofuel is used to produce electricity by burning, and biofuels are alcohols, such as ethanol or other chemicals, derived from biomass or living matter. Given these facts, what produces electricity by burning among the following options: - Green beans - energy - Alcohols - Water - Most plants - Light - Sand - heat energy
Alcohols

Streams may start with runoff or water seeping out of a spring, and then, the stream flows into a larger body of water. Given these facts, what bodies of water may start with runoff among the following options: - solid, liquid, gas - agriculture - flooding - Condensation - smaller ones - loose soil - reducing acid rain - storms
smaller ones

Chemical weathering causes iron in rock to oxidize, and when iron oxidizes it produces iron oxide, more commonly referred to as rust. Given these facts, rust of iron in rocks is a direct result of among the following options: - solar heating - high speed fall from space - Chemical energy - The area was once underwater - permineralization - Temperature - volcanic ejection - chemical weathering
chemical weathering

HIV infects and destroys helper T cells, and lets Meet the HIV HIV is a new virus. Given these facts, what can infect and destroy helper T cells among the following options: - Q cells - Cooking - bacteria - red blood cells - a-a gradients - parasites - viruses - cigarettes
viruses