Please check my answers, I still adding more details to answers what is below is what the my answers with out the detail. Just need somone to check to see if its correct before i start going into great detail.
following questions as it relates to the nine phyla in the assignment table. (Porifera, Cnidaria, Nematoda, Athropoda, Platyhelminthes, Annelida, Mollusca, Echinodermata, and Chordata.)
1.“Which phyla lack organs? What type of symmetry do they have?
Answer: Porifera and the Cnidaria, The Porifera lack symmetry in their body plan. The Cnidaria have a radial symmetry.
2.List all of the phyla that show cephalization?
Answer: Platyhelminthes, Nematoda, Annelida, Mollusca, Arthropoda and Chordata
3.“Do all organisms on the table have 3 germ layers (endoderm, ectoderm and mesoderm)? If not, which Phyla have fewer than three germ layers?
Answer: Porifera, Cnidaria
4.One phylum has more species than all the others. State the name of this phylum and provide several different examples of species found in this phylum.
Answer: Arthropoda has more species than all the other phyla. In the group Arthropoda we can find Insects, Arachnids and Crustaceans. There are over 1 million known species in this group, such as crabs, butterflies, ants, beetles, scorpions, ticks, centipedes, spiders and lobsters.
5.According to chapter 24, fish do not all have the same skeletal structure? Describe the differences among fish from the most primitive to more advanced types.
Answer: Not all fish have the same skeletal structure. There are three different types; the jawless fish, the cartilaginous fish and the bony fish. The primitive fish lack jaws and pelvic and pectoral fins. These fish are largely extinct. There are still two living groups; the lampreys and the hagfishes. Fishes of the class Placodermi (extinct) were the first to develop jaws and paired fins. They had bony skeletons and were covered in bony armor. The cartilaginous fish, such as sharks, rays and chimaeras) have a cartilage skeleton. They don’t have a swim bladder or lungs and they don’t have a gill
covering. The bony fish are distinguished from the others by their bone skeletons and the presence of a swim bladder (and sometimes lungs). The bony fish are divided into two subclasses; the fleshy-finned fish and the ray-finned fish.
6.Describe the three types of mammals based on how their young develop?
Answer: These types are the monotremes, the marsupials and the placentals. The primitive monotremes lay eggs (ex. platypus and echidna). The marsupials give birth to immature young and develop them in a pouch (ex. kangaroo and koala). The placental mammals give birth to live young. The placenta (inside the mother) feeds them as they develop in the womb before they are born (ex. whales, dogs and humans).
following questions as it relates to the nine phyla in the assignment table. (Porifera, Cnidaria, Nematoda, Athropoda, Platyhelminthes, Annelida, Mollusca, Echinodermata, and Chordata.)
1.“Which phyla lack organs? What type of symmetry do they have?
Answer: Porifera and the Cnidaria, The Porifera lack symmetry in their body plan. The Cnidaria have a radial symmetry.
2.List all of the phyla that show cephalization?
Answer: Platyhelminthes, Nematoda, Annelida, Mollusca, Arthropoda and Chordata
3.“Do all organisms on the table have 3 germ layers (endoderm, ectoderm and mesoderm)? If not, which Phyla have fewer than three germ layers?
Answer: Porifera, Cnidaria
4.One phylum has more species than all the others. State the name of this phylum and provide several different examples of species found in this phylum.
Answer: Arthropoda has more species than all the other phyla. In the group Arthropoda we can find Insects, Arachnids and Crustaceans. There are over 1 million known species in this group, such as crabs, butterflies, ants, beetles, scorpions, ticks, centipedes, spiders and lobsters.
5.According to chapter 24, fish do not all have the same skeletal structure? Describe the differences among fish from the most primitive to more advanced types.
Answer: Not all fish have the same skeletal structure. There are three different types; the jawless fish, the cartilaginous fish and the bony fish. The primitive fish lack jaws and pelvic and pectoral fins. These fish are largely extinct. There are still two living groups; the lampreys and the hagfishes. Fishes of the class Placodermi (extinct) were the first to develop jaws and paired fins. They had bony skeletons and were covered in bony armor. The cartilaginous fish, such as sharks, rays and chimaeras) have a cartilage skeleton. They don’t have a swim bladder or lungs and they don’t have a gill
covering. The bony fish are distinguished from the others by their bone skeletons and the presence of a swim bladder (and sometimes lungs). The bony fish are divided into two subclasses; the fleshy-finned fish and the ray-finned fish.
6.Describe the three types of mammals based on how their young develop?
Answer: These types are the monotremes, the marsupials and the placentals. The primitive monotremes lay eggs (ex. platypus and echidna). The marsupials give birth to immature young and develop them in a pouch (ex. kangaroo and koala). The placental mammals give birth to live young. The placenta (inside the mother) feeds them as they develop in the womb before they are born (ex. whales, dogs and humans).