Mosses and ferns do not produce seeds; they are referred to as "seedless" plants, instead producing easily-damaged spores in great numbers for reproduction.
The sodium is alkali metal it cannot be easily burn in a small flame
Exercise.
Aluminum is a metal. Most structural metals do not burn easily. Aircraft fuselages are manufactured from an alloy that is mainly aluminum. A key requisite for safety is that it does not burn easily.
Flammable.
what is the measure of how easily a substance will burn or combine
combustible
No, it is nonflammable and does not easily react at all.
It means something will burn easily.
Some are and some are not. Hydrocarbon based lubricants and greases will burn very easily. Silicone and PEG based versions do not burn easily at all.
There are 20,000 species of ferns. Ferns are vascular.
ferns