What are 3 things that must be present for a internal combustion engine to operate?

Explain how earth is like a giant bar magnet. how is our magnetic field made?

Ricks boss often appriciates him for his work. how is rocks boss affecting his proformence

The smokey mountains have over 2,100 miles of rushing mountain streams and rivers that flow through the park. in each mile lives a diverse community of native fish, amphibians, insects, and larvae, some of which are found only in the southern appalachians. park managers and scientific researchers test many factors such as fish populations, the watersheds and water tests to determine a) too many lizards are present b) the water quality of the stream c) rainwater is running into local streams d) if visitors to the park are overstaying their welcome