Unlike identical twins fraternal twins

One of the most observable differences between identical twins and fraternal twins is their faces. Identical twins have almost similar faces, that’s why it’s termed ‘identical’ and it’s hard for people to distinguish who is who without much observation. Fraternal twin have different faces but are born on the same day with little time difference.

i think the miocene epoch spans the time from 23 million to 12 million years ago.

if your own plato the answer is b. the fern transitioned from sporophyte generation to gametophyte generation.