When did vertebrates first evolve?
about 525 million years ago
What are the earliest known vertebrates?
The earliest vertebrates were jawless fish, similar to living hagfish. They lived between 500 and 600 million years ago. They had a cranium but no vertebral column. The phylogenetic tree in Figure below gives an overview of vertebrate evolution.
What were the major factors that drove vertebrates to conquer the land?
Driving factors It took many millions of years for vertebrates to transition out of water onto land. During this time, both the competitive pressures that would push species out of the water and the niche occupation incentives that would pull species onto land were slowly building.
Which is the correct sequence for the evolution of reptilian features?
The correct sequence for the evolution of reptilian features is a notochord, vertebrae, jaws, bony skeleton, lungs, 4 limbs and an amniotic egg.
Are vertebrates a phylum?
Which of the following groups are considered chordates but are lack a vertebral column?
Non-vertebrate chordates: Cephalochordata (lancelets), Urochordata (Tunicates), and Myxini (hagfishes) These groups are the chordates which do not possess vertebrae. Many are hermaphroditic, sessile or buried within the sand of aquatic environments, and hatch from eggs within the parent’s body.
Which of the following is a characteristic of all animals?
what characteristics do all animals share? all animals are members of the kingdom Animalia, they are multicellular, heterotrophic, eukaryotic organisms whose cells lack cell walls.
What is the main reason that mammals underwent adaptive radiation after the demise of the dinosaurs?
The mammals had little competition so it was easier for them to evolve into the niches that were once occupied by the dinosaurs.
Which of the following adaptations allowed reptiles to complete their life cycles on land?
One of the key adaptations that permitted reptiles to live on land was the development of their scaly skin which contains the protein keratin and waxy lipids, reducing water loss from the skin. Due to this occlusive skin, reptiles cannot use their skin for respiration, as do amphibians; all breathe with lungs.
Which organism is a monotreme?
These three groups are monotremes, marsupials, and the largest group, placental mammals. Monotremes are mammals that lay eggs. The only monotremes that are alive today are the spiny anteater, or echidna, and the platypus. They live in Australia, Tasmania, and New Guinea.
Which characteristic is found in all vertebrates?
As chordates, all vertebrates have a similar anatomy and morphology with the same qualifying characteristics: a notochord, a dorsal hollow nerve cord, pharyngeal slits, and a post-anal tail.
Which best describes current evidence and ideas about the evolution of the first tetrapods?
Which best describes current evidence and ideas about the evolution of the first tetrapods? Currently, it appears that the first tetrapods were fish that lived in shallow water and used their limbs to lift themselves out of the water and gulp air.
Which of the following is a tetrapod?
The Four-Legged Vertebrates The word “Tetrapoda” means “four legs” in Greek. Amphibians, reptiles (including dinosaurs and birds) and mammals are the major groups of the Tetrapoda. Tetrapods include all land-living vertebrates, such as frogs, turtles, hawks, and lions.
Which bird adaptation is probably less well developed in flightless birds?
Which bird adaptation is probably less well-developed in flightless birds such as penguins and ostriches? have hair and mammary glands.
Which of the following animal groups is characterized by the absence of tails?
which of the following animal groups is characterized by the absence of tails? reptiles are not able to eat as frequently as mammals and birds can eat. This is due to a trait that mammals and birds share but reptiles do not have.
Which of the following is a typical characteristic of molluscs?
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|All animals||are heterotrophic|
|Which of the following is a typical characteristic of molluscs?||a rasping organ called the radula|
|Which mollusc group includes primarily sedentary animals that use mucus-coated gills to trap fine food particles?||bivalves|
Which of the following phyla is most closely related to echinoderms?
Which of the following are threats to the biodiversity of invertebrates?
Which of the following are threats to the biodiversity of invertebrates? habitat destruction, non-native(invasive) species, habitat degradation.