Question

which is not an accurate description of the relationship among chordatas?

a) all possess a "chord" i.e. a backbone

b) all vertebrates are chordatas but not all chordatas are vertebrates

c) within the phylum that contains humans, there exist closely related invertebrate species

d) an endoskeleton has allowed vertebrates to become much larger (and more successful) than non-vertebrates

Answer 1

answer .

Option 'a' is not accurate description among chordates. Because. All chordates do not possess a backbone.

Invertebrate chordates are animals of the phylum Chordata that possess a notochord at some point in their development, but no vertebral column (backbone).

Explaination

b.

characteristic features of the phylum Chordata include the presence of a notochord and paired pharyngeal gill slits. In sub-phylum Vertebrata, the notochord present in embryos gets replaced by a cartilaginous or bony vertebral column in adults. But in cephelochordates, notochord persists throughout life as such and in urochordates, notochord is present only in larval stages and absent in adults. Thus, it can be said that all vertebrates are chordates but all chordates are not vertebrates.

C.

a species of sea squirt called the Star ascidian (Botryllus schlosseri) is believed to be the most closely-related invertebrate to humans, with 77% of human genes present.

d.

endoskeleton enables movement by providing bony surfaces for muscle attachment. Usually, skeletal muscles attach to bones by tendons. An endoskeleton is usually stronger and provides more protection from physical force than an exoskeleton.endoskeleton grows as the animal grows.