Answer :
It should come as no surprise that biologists also divide species into many categories by assessing how similar and distinct things appear to be. The underlying premise is that biological relationships are closer when there is a higher degree of physical similarity.
believe this is an adult .The vertebral column, ribs, and sternebrae, which are "on" the midline, and appendicular components, which include the forelimbs, hindlimbs, pectoral and pelvic girdles, which are "off" the midline, make up the postcranial skeleton, which is comprised of all the bones and cartilages caudal to the head skeleton.The environment is in a whirlwind with all living things. The organism develops a certain kind of biological relationships with respect to resources; some organisms compete with one another while others depend on one another for survival. These traits are broken down into four categories: parasitism, commensalism, predation, and mutualism. Both organisms profit from a symbiotic relationship.
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