Observe the layers of the graph below.
layer 1: a, c
layer 2: e
layer 3: a, d,f
layer 4: b
layer 5: f, c
layer 6: d, b

what is most likely an index fossil?
a.) a
b.) b
c.) d
d.) e

Answer    "a salt" would be the best answerexplanationsalts can be defined as ionic compounds that are neither acids nor bases. nacl is an example of a salt, and its ionic.an enzyme is an organic compound which is covalently bonded, not ionically bonded.acids are generally held together by covalent bondsan element does not need any bonds to exist

Reaction type : double replacement hcl + lioh = h2o + licl

Density= mass/volume so 5.1 divided by 4.7 is  5.1 / 4.7 =1.08510638298round to the correct number of sig figs