Which characteristics of a fossil would make it useful as an index fossil in 1 point determining the relative age of widely separated rock layers?

a. a wide time range and a narrow geographic range

b. a wide time range and a wide geographic range

c. a narrow time range and wide geographic range

d. a narrow time range and a narrow geographic range

C

Explanation:

Because it only makes sence I mean it goes exactly with what the question asks.

explanation:

the fossil record extends back to a dog-like ancestor some 55 million years ago, which gave rise to the first horse-like species 55 to 42 million years ago in the genus eohippus.

i think its control and coordinate because im pretty sure thats what tissue does and the joints are what control movement and then your skeletal/ bones provides portection. hope that .