What freed reptiles from dependence on water for reproduction?
All amniotes share the possession of the amniotic (cleidoic) egg, which freed them from dependence on water for reproduction.
What is the unique feature of lampreys and hagfish?
These animals have an elongated, eel-like shape, and do not have any paired fins on their sides. Lampreys and hagfishes have gill pouches for ventilation, connected to the external environment by numerous holes or slits on the sides of the body and back of the head. These animals have a simple, cartilaginous skeleton.
What does the term tetrapod mean quizlet?
having four limbs. You just studied 51 terms!
What is unique about Agnathans represented today by lampreys?
What is unique about agnathans, represented today by lampreys? They have vertebral columns. They have a notochord. They are jawless vertebrates.
What are two characteristics that freed reptiles from dependence on water?
30 Cards in this Set
| A(n) ___ is an example of a mollusk that does not have a shell. | octopus |
|---|---|
| The group that may have given rise to amphibians are the ___. | lobe-finned fishes |
| The feature present in reptiles and absen tin amphibians that freed reptiles from dependence on water for reproduction is ____. | the amniotic egg |
What name is given to the seafloor?
The seabed (also known as the seafloor, sea floor, or ocean floor) is the bottom of the ocean.
What are the two defining features of the class Mammalia?
Two characteristics are used to define the mammal class. They are mammary glands and body hair (or fur).
What is unique about agnathans?
Agnatha. Class Agnatha consists of an ancient group of animals similar to fish but with some very noticeable differences. The agnathans lack jaws and paired fins. Instead of jaws, they have a cyclostomic (circular) toothed mouth with which they bore into the side of a fish and suck the blood of their victim.
What are the features of seafloor?
Features of the ocean include the continental shelf, slope, and rise. The ocean floor is called the abyssal plain. Below the ocean floor, there are a few small deeper areas called ocean trenches. Features rising up from the ocean floor include seamounts, volcanic islands and the mid-oceanic ridges and rises.
What does the seafloor look like?
All the way down At depths below about 4,000 m (2.5 mi), the seafloor is called the abyssal plain. It is essentially flat because the rugged topography of the underlying basaltic crust is draped in sediment that can be up to five km (three mi) thick. The abyssal plains cover 25% of the Earth’s surface.
