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Why are protochordates not classified as true chordates?
any member of either of two invertebrate subphyla of the phylum Chordata: the Tunicata (sea squirts, salps, etc.) and the Cephalochordata (amphioxus). Like the remaining subphylum of the chordates, the Vertebrata, the protochordates have a hollow dorsal nerve cord, gill slits, and a stiff supporting rod, the notochord, the forerunner of the backbone. The protochordates differ chiefly from the vertebrates in not having a backbone. Recent protochordates are thought to have evolved from the same ancestral stock as that which gave rise to the vertebrates.
What were the first vertebrates to evolve?
jawless fishes
How do vertebrates evolve?
fish- amphibians- reptiles- birds -mammals
What do protochordates breathe through?
by there skin
What animal is in chodates?
Vetebrates and protochordates.
What did invertebrates evolve from?
They were the original form of life and they came before vertebrates.
Does a fish evolve into a shark?
Sharks are a type of fish. This is because fish are defined as being vertebrates with gills.
Arthropods invaded land about 100 million years before vertebrates did so This most clearly implies that?
Arthropods have had more time to co-evolve with land plants than other vertebrates.
Did the first vertebrates evolve during the mesozoic era?
No. The 1st vertebrates appeared in the fossil record about 525 million years ago during the Cambrian Period. This was in the Paleozoic Era.
Which creatures came next on earth after fish?
After fish, amphibians were the next group of creatures to evolve on Earth. Amphibians are cold-blooded vertebrates that can live both on land and in water. They were the first vertebrates to colonize terrestrial habitats.
Is a snake a vertebrates or invertebrates?
Snakes are vertebrates.
Are jaguars vertebrates or non-vertebrates?
vertebrates
