Explanation
Characteristics of class Reptilia are as follows:
1) Hard, horny scaly skin, four legs and breathe with lungs.
2) Three-chambered heart (crocodiles have a four-chambered heart), breathe through lungs, cold-blooded or poikilothermic.
3) Eggs have a leathery shell.
4) Unisexual, oviparous, fertilization is internal.
5) For example, turtle, chameleon, snakes, lizards etc.
So, the correct answer is option D.
$$\textbf{Correct Option A}$$
$$\textbf{Solution}$$
$$\bullet$$ Balanoglossus define under the Phylum of hemichordate, which are marine animals that have rudimentary notochord present in them.
$$\textbf{Correct option: D}$$
$$\textbf{Solution:}$$
Option A:
$$\bullet$$ Arthropoda phylum has all types of insects.
Option B:
$$\bullet$$ Porifera includes sponges.
Option D:
$$\bullet$$ Vertebral column is found in Vertebrates.
$$\bullet$$ In vertebrates, the vertebral column (spinal column, spine, or backbone) is a flexible column that extends from the neck to the tail and is made up of a series of bones called vertebrae.
$$\bullet$$ The vertebral column's primary function is to protect the spinal cord.
$$\bullet$$ It also stiffens the body and serves as an attachment point for the pectoral and pelvic girdles, as well as many muscles.
$$\bullet$$ An additional function in humans is to transmit body weight when walking and standing.
Hence the correct option is option D.
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