Can anyone me?

when an object is moving away from you while making a sound, the pitch of the sound is perceived to

a. lower

b. higher

c. fluctuating

d. unchanged

The minerals found in bones are deposited by living cells called

In france, grapes are 1.95 euros per kilogram. what is the cost of grapes, in dollars per pound, if the exchange rate is 1.14 dollars/euro? (2.6)

Suppose you mix one mole of sulfuric acid (h2so4) with 1 mole of sodium hydroxide(naoh). why does the ph of the solution remain below 7? ( explain so i can get better understanding! )