contains information related to the subject.
it could be useful by helping others with their explorations
They both burn easily with lots of heat.
Heat is useful as It IS our main heat source keeps us warm and help us in our daily lifes. Solar Panels are used to trap Heat
Useful: Energy Light Sound Non-Useful: Electricity C02
Good source of lycopene.
this source is not useful
Glycogen is the source of energy in muscles
Media is a source of information and can be very useful.
Relevant
no it never ha and never will
Relevant
contains information related to the subject.
The first time you find a piece of useful information from a source
Chickens are extremely useful. Chickens, and their eggs, are an important food source for people.
Limestone is the rock that is most useful to modern industrial countries because it is the source for the main ingredient in cement.
They're better as a food source, not much else.