Need help please Mark each statement as true or false, and if false, restate it
ID: 148318 • Letter: N
Question
Need help please
Mark each statement as true or false, and if false, restate it to make it true: Sponges, jellyfish, and flatworms are all classified as either diploblastic or triploblastic .Starfish and vertebrates are deuterostomes, whereas clams an insects are protostomes Cnidarians have surface cells called choanocytes that contain prey-capturing structures known as nematocysts The 8-cell embryo stage precedes gastrulation in protostomes but not in deuterostomes In all probability, the original function of the coelom was reproduction In most protostomes, the coelom develops from cells that migrate in from the skin or cuticle All terrestrial vertebrates produce an amniotic egg Although most modern fishes have movable jaws and paired fins, some primitive fishes lack both.
Explanation / Answer
1. False.
Diploblastic animals: have 2 cell layers in embryo - ectoderm and endoderm; Triploblastic: have 3 cell layers in embryo - ectoderm, endoderm, and mesoderm. Jellyfish is diploblastic, flatworms are Triploblastic and Sponges are monoblastic.
2. True. Starfish and vertebrates are deutrostomes, whereas clams an insects are protosomes.
3. False. Cnidarians have surface cells called choanocytes that contains prey-capturing structures known as nematocysts.
Because Cnidarians have speciliazed cell known as cnidocytes organelles called nematocycts, choanocytes are present in sponges.
4.False .The 8-cell embryo stage precedes gastrulation in protostomes but not in deuterostomes.
Because the 8-cell embryo stage precedes gastrulation in both protostomes and deuterostomes.
5. False. In all probability, the original function of the coelom was reproduction.
Because the original function of coelom is to provide as a protective cushion for their internal organs. In some animals, such as worms, the coelom acts as a skeleton. The coelom also allows the internal organs to move and grow independently of the outer layer of the body wall.
6. True. In most protostomes, the coelom develops from cells that migrate in from the skin or cuticle.
7. True. All terrestrial vertebrates produce an amniotic egg.
An "Amniote" is an animal whose eggs have waterproof linings (i.e. an amnion); all vertebrates after amphibians have amniotic eggs, allowing them to develop on land.
8. True. Although most modern fishes have movable jaws and paired fins, some primitive fishes lack both
It is true that most primitive fish lacks both: movable jaws and paired fins, e.g. Hagfish, lampreys.
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