The role of species in an ecosystem, consisting of such things as what it eats, when it eats, and where it lives is niche.
I think is D,,,,,,,,,,,,,,,,,
A possible Hypothesis probably .
The correct answer is absence of jaws.
Lampreys and hagfish are in the class Agnatha, they are jaw-less fish. The members of the agantha class are probably the earliest vertebrates. Scientists have found fossils of agnathan species from the late Cambrian period that occurred 500 million years ago.
