Discussion
Insects, ammonoids and amphibians have originated in which of the following periods of Paleozoic era ?
Answer: D
Insects, ammonoids and amphibians originated in the Devonian period.
The Devonian (about 419 to 359 million years ago) has the earliest known insect fossils, the first ammonoids, which evolved from straight-shelled nautiloids early in the period, and the first four-limbed vertebrates, the earliest amphibians such as Ichthyostega and Acanthostega, near its end.
The Cambrian saw the radiation of most animal phyla, the Ordovician the spread of marine invertebrates and early vertebrates, and the Silurian the first jawed fishes and early land plants, all before these three groups appeared.
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