1. Which common feature indicates that fishes, reptiles, amphibians, birds, and mammals evolved from a common ancestor?
A. an internal digestive system
B. a boney skull to protect the brain
C. gills or lungs for gas exchange
D. an internal skeleton with a backbone

since there are no options posted i'll give you a few examples.

a dolphin's flipper, bird's wing, cat's leg.

one part of the electromagnetic spectrum that arrives on earth as solar radiation from the sun is the visible spectrum. wavelengths of the visible spectrum combine to form what we refer to as

answer - d) ultraviolet radiation.

violet /   380–450 nm / 668–789 thz

violet is number 1 in the chart of visible light.

the answer is b.

hope it