Answer:
Hydrogen
Lithium ,Beryllium,Nitrogen
Sodium.Magnesium,Phosphorus
Potassium,Calcium,Arsenic
Rubidium,Strontium,Antimony
fermentation
Explanation:
a
me has answer
b
Answer: When waves travel from one medium to another the frequency never changes. As waves travel into the denser medium, they slow down and wavelength decreases. Part of the wave travels faster for longer causing the wave to turn.