Which of the following inferences can best be made from the fact that arthropods colonized land about 100 million years before vertebrates?
1) Arthropods are more adaptable to terrestrial environments than vertebrates.
2) Vertebrates evolved from arthropods.
3) Arthropods and vertebrates have similar adaptations for living on land.
4) Vertebrates are more successful than arthropods in colonizing new habitats.