Question

Fill in the blanks: 1) the frequency of sound is measured in ____________. 2) the ___________ is used while definitely the zodiac signs. 3) ______________ is called black gold. 4) Fluoride is used in toothpaste to prevent ___________.​

Answer 1

Answer:

hertz 2.ecliptic 3.oil nd petroleum 4.tooth decay

Explanation:

here is your Answer hope it helps mark me as brainliest answer please