When one says "Vampire Bat" most people associate the little creatures with diseases or even blood. But studies have shown that the saliva of a vampire bat contains materials that can break up blood clots and save the lives of stroke patients.
Yes, though it is not easy to think of a situation where it would be useful.
Sloth saliva is toxic, consequently a bite needs to be treated with antibiotics.
oxygen
Fuels
The physical properties of a pure substance can be used to identify it. A pure substance is an element or a compound, not a mixture.
The base word for "useful" is "use." It is derived from the word "use," which means to utilize or employ something for a specific purpose.
agar
Its Considered a ore.♥
A Citrate Additive is used for controlling the acidity of a substance
Characteristic properties.
Fat is a useful storage substance for bats. This is because fat has over two times the energy content per mass unit versus proteins and carbohydrates.
Density is specific for each substance. Also the measurement is generally simple.