Add to ORKGThe first animals arise when marine protoctists curtail reproduction in favor of specialization. They are very small, with only soft-body parts, so they may swim with their protoctist cousins for millions of years before circumstances are favorable for their preservation in the fossil record.https://scholarworks.umt.edu/awalkthroughtime/1049/thumbnail.jp
The term “invertebrate ” recalls all animal species lacking a backbone or a bony skeleton. Although ...
Cetaceans (whales, dolphins, and porpoises) are an order of mammals that originated about 50 million...
The evolutionary emergence of animals is one of the most significant episodes in the history of life...
For years, we knew very little about the microcosmos. Bacteria and protoctists, abundant for over 20...
Reptiles evolve many new species. Reptile fossils are abundant: aquatic reptiles, stem reptiles, e...
Huge dinosaurs rove mid-Jurassic Earth. Bigger is not necessarily better: larger life forms require ...
Small and nocturnal, the first mammals jump, climb, swing and swim through the dinosaur world. Oblig...
Air breathing, four-footed, ambling amphibians leave many marks by the late Devonian Period. Their a...
Human beings belong to the phylum Chordata, all members of which have notochords, cartilage rods dow...
The explosive growth of the fossil record of algae and other organisms moves some paleobiologists to...
We usually think mammal when we hear the word “animal.” In fact, we and this Rhinoceros beetle are...
The Burgess Shale, in the Burgess Pass of the Canadian Rockies, is an impressive fossil-find dating ...
Global environmental change and continental glaciation induce a mass extinction which impacts all ma...
The Paleozoic Era runs from 541 to 245 million years ago, and geologists divide it into six major pe...
It was not that long ago when the origin of the first vertebrate (fish) was pushed back into the Lat...
The term “invertebrate ” recalls all animal species lacking a backbone or a bony skeleton. Although ...
Cetaceans (whales, dolphins, and porpoises) are an order of mammals that originated about 50 million...
The evolutionary emergence of animals is one of the most significant episodes in the history of life...
For years, we knew very little about the microcosmos. Bacteria and protoctists, abundant for over 20...
Reptiles evolve many new species. Reptile fossils are abundant: aquatic reptiles, stem reptiles, e...
Huge dinosaurs rove mid-Jurassic Earth. Bigger is not necessarily better: larger life forms require ...
Small and nocturnal, the first mammals jump, climb, swing and swim through the dinosaur world. Oblig...
Air breathing, four-footed, ambling amphibians leave many marks by the late Devonian Period. Their a...
Human beings belong to the phylum Chordata, all members of which have notochords, cartilage rods dow...
The explosive growth of the fossil record of algae and other organisms moves some paleobiologists to...
We usually think mammal when we hear the word “animal.” In fact, we and this Rhinoceros beetle are...
The Burgess Shale, in the Burgess Pass of the Canadian Rockies, is an impressive fossil-find dating ...
Global environmental change and continental glaciation induce a mass extinction which impacts all ma...
The Paleozoic Era runs from 541 to 245 million years ago, and geologists divide it into six major pe...
It was not that long ago when the origin of the first vertebrate (fish) was pushed back into the Lat...
The term “invertebrate ” recalls all animal species lacking a backbone or a bony skeleton. Although ...
Cetaceans (whales, dolphins, and porpoises) are an order of mammals that originated about 50 million...
The evolutionary emergence of animals is one of the most significant episodes in the history of life...