The gestation period for an elephant is 640 to 660 days. This is equivalent to about 95 weeks, or 22 months, and is the longest gestation period of any mammal.
Dimes dated after 1964 are copper-nickel clad and contain no silver. Quarters are also clad, except for the bicentennial commemorative coins with an S mint mark that were produced for mint and proof sets. Kennedy half dollars from 1965 to 1970 were 40 percent silver composition. After 1970, all Kennedy halves were clad, except the same S bicentennial issue.
Rating Newest Oldest. Best Answer: Quarters after 1964 are copper nickel clad, there is no silver. only the 1/2 dollars from 1965-1970 are 40% silver. There was a 1976 silver quarter as well as the proof silver state quarters. Source(s): 48 years a numismatist.