Question

Explain please

Ch. 34 N) Characteristics of Phylum Chordata. Closest invertebrate related phyla. O) Early chordate evolution in terms of Hox genes. P) Evolution of land based tetrapods in terms of Gnasthostomes that have limbs. Q) Ostiechthyans and land based tetrapods. R) Features making amphibians sensitive to environmental changes. S) Amniotic eggs with non amniotic eggs; Adult amniote and amphibian ventilation. T Derived characteristics that separate reptiles from other tetrapods. U) Derived characters of birds; factors related to their emergence V) Derived characters of mammals; factors related to their emergence

Answer 1

Answer:

1. They have the characteristic of having notochord

2. They have hollow dorsal nerve cord pharyngeal slits, endostyle and a post-anal tail

3. These are deuterostomes due to the reason that arms forms before mouth

4. Bilateral symmtry

5. Metameric segmentation

6. Circulatory system

Echinoderms closet invertebrates are marine animals which possess pentardial symmtry and a spiny body covering the phylum. It includes stars, sea urchins and sea cocumber.