The only living agnathans arelampreys and hagfishes(class Cyclostomata), which are parasites or scavengers. Fossil agnathans, covered in an armour of bony plates, are the oldest known fossil vertebrates. They have been dated from the Silurian and Devonian periods, 440–345 million years ago. ...
Jawless fish include 76 species of hagfish and 38 species of lampreys, the two types of fish found in class Agnatha. This is the oldest of the three classes of fish in phylum Chordata. The other classes are Chondrichthyes and Osteichthyes....
What classifies a creature as a vertebrate or invertebrate? What type of diet do they have? Are they aquatic or terrestrial animals? The segmented body is the characteristic feature of which phylum of the animal kingdom? Contrast and compar...
Manta rays account for approximately 0.2 percent of all cartilaginous fish. This is because there are approximately 1,000 species in the class...Become a member and unlock all Study Answers Start today. Try it now Create an account Ask a question Our experts can answer your tough homework...
Lampreys /ˈlæmpreɪz/ (sometimes inaccurately called lamprey eels) are an ancient extant lineage ofjawless fish of the order Petromyzontiformes/ˌpɛtroʊmɪˈzɒntɪfɔːrmiːz/, placed in the superclass Cyclostomata. The adult lamprey may be characterized by a toot...
In "Class" Taleb’s Curious Views On Probability — Part II: Skin in the Game August 29, 2017 In "Class" February 7, 2023,8:59 am “Nigger” fried their circuits. Good to know. If you ever get in a jam just look ‘em in the eye and say, in steely tones —niggerthen make you...
For free lessons you can look at popular education sites and get your children prepped for early biology class. If you want to have some fun, bringing a sample of a vertebrate, such as a mouse, and an invertebrate, such as a worm, can really show your kids what you're talking about....
And speaking of “normal” or “typical,” morphology is of course often not that way even within a species, age class or gender. Pathology is a great example; by definition it is abnormal. It is a shattering of the “essence” of animals, brought on by some malady. Next I’ve highli...
Keep the predilection for over-attributing Covid deaths in mind. Then look to weeks 30-40 or so. Anything past that is subject to late counting (takes about 8 weeks to get bulk of data in; last three weeks have black dots). Both the red and green dotted lines are higher than we’d...
Bony fish are considered to members of the classOsteichthyes, which is subdivided into two main types of bony fish: Ray-finned fishes, orActinopterygii Lobe-finned fishes, or Sarcopterygii, which includes thecoelacanthsand lungfishes. The subclass Sarcopterygii is made up of about 25,000 speci...