Question

question 4 (mandatory) (2 points)
by the end of the ___ period, all major animal lineages were present in the seas due to a great adaptive radiation of animals.
o a) cambrian
b) permian
o c) jurassic
d) triassic
e) devonian
question 5 (mandatory) (2 points)
the vertebrate lung first appeared in
o a) fishes

Explanation:

The Cambrian period is known for the Cambrian explosion, a significant adaptive radiation event where most major animal phyla (lineages) appeared in the fossil record. This matches the description in Question 4. For Question 5, the vertebrate lung first appeared in fishes. Some fish groups like lungfish have structures that are precursors to the lungs of terrestrial vertebrates.

Answer:

Question 4: a) Cambrian
Question 5: a) Fishes