Can you please solve all these questions. thanks in advance! magine you are a pa

Question

Can you please solve all these questions. thanks in advance!

magine you are a paleontologist working in Ediacaran deposits and you find a new fossil species with a shell of some sort. This would probably make the "news" section of Science and Nature because. A) animals from the Ediacaran have only bilateral symmetry B) animals from the Ediacaran typically have cephalization but no shells. C) animals from the Ediacaran normally have no shells or any other hard D) animals from the Ediacaran are only vertebrates parts. 2) Sponges and cnidarians are among the fossi animals found in both the Ediacaran Hills and Burgess Shale from the Rocky Mountains of British Columbia. This observation supports the h ancestral sponges and cnidarians had once been terrestrial animals. B) North America and Australia were united to each other about 550 million years ago. C) only sponges and enidarians existed at the time these sediments were deposited D) land that now comprises the Ediacaran Hills and the Rocky Mountains was under water about 550 million years ago. 3) You discover a new animal that you sus should also note that it.. pect may be a sponge. You note it is neither diploblastic nor triploblastic. You A) has no spicules. B) has no nerve or muscle tissue C) has no collar cells. D) has no osculum. 4) Which characteristic would be uninformative when trying to distinguish between a hydra and a planarian? A) dorsoventrally flattened body B) radial symmetry C) single opening to the digestive system D) centralized, ladder-like nervous system 5) What is the best anatomical feature to look for to decide that a mollusk you found in the ocean is a true crab and not a horseshoe "crab? A) Presence of compound eyes B) Claw-like mouthparts (chelicerae) C) Two tagmata (cephalothorax and abdomen) D) Hard carapace 6) While sampling marine plankton in a lab, a student encounters large numbers of fertilized eggs. The student rears some of the eggs in the laboratory for further study and finds that the blastopore becomes the mouth. The animal has torsion and eventually develops a radula. These eggs belong to a A) clam B) squid. C) chiton. D) snail. 7) A stalked, sessile marine organism has several elongated feeding structures surrounding an opening where food is ingested. This organism could potentially be a cnidarian, a tube-dwelling worm, a crustacean or an echinoderm. Finding which of the possibilities below in this organism would allow you to be certain of the organism's identity? A) radial symmetry B) a hard shell composed of calcium carbonate C) the presence of a sac body plan D) a nervous system Use this paragraph to assist in answering questions 8-10 An elementary school science teacher decided to liven up the classroom with a saltwater aquarium. Knowing that saltwater aquaria can be quite a hassle, the teacher proceeded stepwise. First, the teacher conditioned the water. Next, the teacher decided to stock the tank with various marine invertebrates, including a polychaete (annelid), a siliceous sponge, several bivalves, a shrimp, several sea anemones of different types, a colonial hydra, a few coral species, a sea star, and several herbivorous gastropod varieties. Lastly, she added some vertebrates-a parrotfish and a clownfish. She arranged for daily feedings of copepods and feeder fish 8) Parrotfish have mouths adapted to scrape algae off a coral and can even munch on coral as well. If the aquarium's corals rapidly died in their place would be shards of. A) chitin B) calcium carbonate

Explanation / Answer

Answer:

1) Imagine you are a paleontologist working in Ediacaran deposits and you find a new fossil species with a shell of some sort. this would probably make the "news" section of science and nature because:

2) Sponges and cnidarians are among the fossil animals found in both the Ediacaran Hills and Burgess Shale from the Rocky Mountains of British Columbia. This observation supports the hypothesis that:

3) You discover a new animal that you suspect may be a sponge. You note it is neither diploblastic nor triploblastic. You should also note that it:?

4) Which characteristic would be uninformative when trying to distinguish between a hydra and a planarian??

5) What is the best anatomical feature to look for to decide that a mollusk you found in the ocean is a true crab and not a horseshoe "crab"?

6) While sampling marine plankton in a lab, a student encounters large numbers of fertilized eggs. The student rears some of the eggs in the laboratory for further study and finds that the blastopore becomes the mouth. The animal has torsion and eventually develops a radula. These eggs belong to:

D) Snail

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