Multiple Choice
Which statement best describes the lower body structures of humans and chimpanzees?
24
views
21. Evolution
Introduction to Evolution and Natural Selection
Struggling with General Biology?
Join thousands of students who trust us to help them ace their exams!Watch the first videoMultiple Choice
Which feature is found in the common ancestor of the deuterostomes?
A
Presence of a chitinous exoskeleton
B
Development of the anus from the blastopore
C
Radial symmetry in adults
D
Segmentation of the body
Verified step by step guidance1
Understand the term 'deuterostomes': Deuterostomes are a group of animals characterized by their embryonic development, where the blastopore (the first opening formed during early development) becomes the anus. This is a key feature distinguishing them from protostomes, where the blastopore develops into the mouth.
Analyze the options provided: Evaluate each feature to determine if it aligns with the characteristics of the common ancestor of deuterostomes.
Option 1: 'Presence of a chitinous exoskeleton' - This feature is associated with arthropods, which are protostomes, not deuterostomes. Therefore, it is not relevant to the common ancestor of deuterostomes.
Option 2: 'Radial symmetry in adults' - While some deuterostomes, like echinoderms (e.g., starfish), exhibit radial symmetry as adults, this is not a universal feature of all deuterostomes or their common ancestor. For example, chordates (another deuterostome group) exhibit bilateral symmetry.
Option 3: 'Development of the anus from the blastopore' - This is the defining characteristic of deuterostomes and would have been present in their common ancestor. It is the correct answer.
4:58mWatch next
Master Evolution and Natural Selection with a bite sized video explanation from Jason
Start learningRelated Videos
Related Practice
Introduction to Evolution and Natural Selection practice set
Problem sets built by lead tutorsExpert video explanations