Answer:
the Echinoderms.
Explanation:
Examples of echinoderms: starfish, sea urchin, feather stars and sea cucumbers.
Answer:
Isolation means that organisms of the same species are separated, and happens when there is something between the organisms that they can't cross.
Explanation:
Organisms become isolated as a result of environmental change. The cause of isolation can be gradual, like when mountains or deserts form, or continents split apart.
