Vertebrates And Invertebrates
They have a jawless, circular mouth with rows of small sharp which aid in holding and feeding on other fishes. Most members of this class are parasites and scavengers.
The mannequin of the triune mind proposed by Paul MacLean, indicating brain areas which might be added throughout vertebrate evolution. The reptilian brain is the principle seat of innate or instinctive behaviors regulating primitive survival issues. Ever growing elaboration of the construction and performance of the mind in larger vertebrates, particularly in humans, made the human brain probably the most advanced of the identified structures.
The origin of jaws marked an necessary point in vertebrate evolution. Jaws enabled vertebrates to seize and devour larger prey than their jawless ancestors. Scientists imagine that jaws arose by way of the modification of the first or second-gill arches. This adaptation is assumed to have at first been a way of accelerating gill air flow.… Read More