I believe A. Nitrogen is the most abundant Gas.
Covalent Bonds hold together atoms within a molecule
They can grow tall, 60 cm plus
Answer:
One of these specifications is a characteristic known as rifling, which refers to the spiral lands and grooves placed into the firearm's barrel to impart a spin on the bullet for accuracy. ... Examiners generally test fire into a water recovery tank to obtain comparison bullets for evaluation under the microscope.