How does this worm differ from all the other worm phyla we studied?

Question

BlackTom AI · Accepted Answer

Question restatement: How does this worm differ from all the other worm phyla we studied? Answer options: 1) Diploblastic 2) No nervous system 3) Ciliated larvae 4) No body cavity 5) No muscles.
Option 1: Diploblastic. This describes organisms with two germ layers (ectoderm and endoderm) and is characteristic of cnidarians and ctenophores, not most worm phyla. Most worms are triploblastic (three germ layers), so this option is incorrect as a distinguishing feature among studied worm groups.
Option 2: No nervous system. Worms typically possess nervous systems, ranging from simple nerve nets to more organized ganglia and ventral nerve cords (depending on phylum). Claiming an absence of a nervous system would be false for the major worm phyla we've studied, making this incorrect.
Option 3: Ciliated larvae. Many invertebrates have ciliated larvae, but this trait is not unique to our worm phyla and is not the defining difference among worm groups. Some worms may have larvae with cilia, but others do not, so this is not a consistent distinguishing feature.
Option 4: No body cavity. A true body cavity (coelom) is present in most worm phyla (e.g., annelids and nematodes have a body cavity, though nematodes have a pseudocoelom rather than a true coelom). A true acoelomate condition (no body cavity) is found in some flatworms, which are not considered true worms in the same sense as annelids and nematodes. If this worm lacks a body cavity whereas the others studied possess one, this would be the distinguishing characteristic.
Option 5: No muscles. Muscles are common across worm phyla, enabling movement. A complete absence of muscles would be unusual and not characteristic of the diverse worm groups studied, making this option unlikely as a distinguishing feature.
Overall, the statement that would most clearly differentiate an acoelomate condition (no true body cavity) from the other worm phyla that typically possess a body cavity (coelom or pseudocoel) aligns with a meaningful taxonomic contrast. Thus, option 4 highlights a structural distinction that is not shared by the majority of the worm phyla discussed.
Important nuance: while some worm groups have pseudocoeloms (like nematodes) rather than a true coelom, the concept of ‘no true body cavity’ marks a notable difference from the coelomates and pseudocoelomates commonly studied in worm diversity. This makes option 4 a plausible differentiating trait in many educational contexts.
In summary, the option stating 'No body cavity' points to the absence of a true body cavity, setting this worm apart from other worm phyla that typically have a body cavity (coelom or pseudocoel).

How does this worm differ from all the other worm phyla we studied?Single choice

Similar Questions

Which of the following structures is most inferior?

What is the name of the body cavity which is protected by the rib cage and is bounded inferiorly by the diaphragm?

2. The abdominal cavity is superior to the pelvic cavity, while the thoracic cavity is inferior to the abdominal cavity.

The heart is within the ________. cranial cavity mediastinum posterior (dorsal) cavity All of the above

How did Egyptian culture and governance change during the Ptolemaic period compared to the pharaonic period?

Name the Supreme Court decision that removed financial constraints on PACs.

Political scientists Joshua Kalla and David Broockman find that senior policy makers made themselves available to _____ between three and four times more often than they did to constituents.

Name the political scientist who argues that parties are designed to serve the needs of ambitious politicians (namely candidates and officeholders).

More Practical Tools for Students Powered by AI Study Helper

Homework AI Solver

Stylized AI Paper Writer

Plagiarism Checker Assistant

Citation AI Academic Writing Tool

In-Class Translation Assistant

AI Note Generator

AI Quiz Answers

Past Exam Questions from University Test Bank

Smart Practice Assistant

Adaptive Practice

Making Your Study Simpler