Using the phylogenetic tree below, which of the following phyla has a coelom?

Question

BlackTom AI · Accepted Answer

To determine which phylum has a coelom from the phylogenetic placement, we examine each option in turn.
Option a: Porifera. Sponges lack tissue organization and do not possess a true body cavity (no coelom). They are typically described as asymmetrical and aggregative cells rather than true organ systems, so this group is not coelomate.
Option b: Acoelomorpha. The acoelomorphs are named for their lack of a coelom (body cavity). They are often discussed as possessing a simple, solid body plan without a true coelomic cavity, so they are not coelomate.
Option c: Cnidaria. Cnidarians (jellyfish, corals, sea anemones) have a diploblastic organization and a single gastric cavity (gastrovacular cavity) but no true coelom. Their body plan lacks a coelom or mesoderm-derived cavity, so this group is not coelomate.
Option d: Mollusca. Mollusks are triploblastic and typically exhibit a true coelom that surrounds the gut within a mesodermally derived cavity. They also show more complex organ systems and body cavity development consistent with coelomate organization, which differentiates them from the previously listed groups.
Overall, the presence of a true coelom is a defining feature that is characteristic of Mollusca among the given options, whereas the others lack a true coelom due to their gerneral body plans and embryology.

BIO 181 (001&002) FALL 2025 3D - Self-Check: Eukaryote Kingdom: Animalia (LO 3D.1, 3D.2, 3D.3, 3D.4)

Using the phylogenetic tree below, which of the following phyla has a coelom?

查看解析

登录即可查看完整答案

类似问题

In a consumer society, many adults channel creativity into buying things

Economic stress and unpredictable times have resulted in a booming industry for self-help products

People born without creativity never can develop it

A product has a selling price of $20, a contribution margin ratio of 40% and fixed cost of $120,000. To make a profit of $30,000. The number of units that must be sold is: Type the number without $ and a comma. Eg: 20000

Which of the following statement regarding cost is correct:

Under the assumptions used in cost-volume-profit analysis, as the activity increases:

The CVP and break-even analysis are supported by a range of important assumptions. Which of the following is not an assumption of the CVP:

The break-even point is that at which:

更多留学生实用工具

考试浏览器助手

风格化写作助手

论文查重助手

文献引用助手

课堂转译助手

课堂笔记助手

Quiz搜索助手

学校历年真题

智能刷题助手

智能匹配练习

希望你的学习变得更简单