Asked by Johnathan Rozell on Jul 07, 2024
Verified
Echinoderms and cnidarians
A) are both radially symmetrical.
B) both have three germ layers.
C) both have the sac body plan.
D) are both deuterostomes.
E) are both found in freshwater.
Radially Symmetrical
A form of symmetry in which body parts are arranged around a central axis, allowing for symmetry in multiple planes.
Deuterostomes
A group of animals in which the anus forms from the first opening in the embryo, with the mouth forming later.
Cnidarians
A phylum of animals that are more complex than sponges, characterized by their radial symmetry, a central gastrovascular cavity, and the presence of cnidocytes; includes jellyfish, corals, and sea anemones.
- Point out and describe the attributes and growth phases of major phyla among animals.
- Understand the concepts and biological importance of body plans and symmetry in animals.
Verified Answer
SC
Sarah ChadwickJul 07, 2024
Final Answer :
A
Explanation :
Both echinoderms and cnidarians exhibit radial symmetry, meaning that their body parts are arranged around a central axis. However, echinoderms have a pentaradial symmetry (divisible by fives), while cnidarians have a biradial symmetry (divisible by twos). Choices B, C, D, and E are all incorrect because echinoderms and cnidarians differ in germ layer number, body plan, embryonic development, and habitat.
Learning Objectives
- Point out and describe the attributes and growth phases of major phyla among animals.
- Understand the concepts and biological importance of body plans and symmetry in animals.