Suppose that among a group of fish species five traits appea

Suppose that, among a group of fish species, five traits appear in the fossil record in the following order, from top layer to bottom layer:

TOP LAYER: Spots, Stripes, Horns, Pelvic spines, Head crest: BOTTOM LAYER

Which trait do you expect to be the most widespread among these fish species?

spots

pelvic spines

stripes

horns

head crest

Solution

e. head crest

Reason:

Sheppy fossil fish species have these five traits appear in their morphology in the following order, from top layer to bottom layer spots, stripes, horns, pelvic spines and head & head crest is the soft tissue that was observed among these fish species. This is the small, rounded head crests in low supraoccipital crest found in a majority of fossil fish species such as, Pteranodon & laytonia