Question

structures that are structurally similar but have different functions in related organisms are called ______.

a homologous

b symmetrical

c vestigial

d analogous

Explanation:

To solve this, we analyze each option:

• Option a: Homologous structures are structurally similar (due to common ancestry) but can have different functions in related organisms. This matches the description.
• Option b: Symmetrical refers to balance in body structure, not related to structural similarity with different functions.
• Option c: Vestigial structures are remnants with reduced or no function, not about structural similarity with different functions.
• Option d: Analogous structures have similar functions but different structures (due to convergent evolution), which is the opposite of the description.

Answer:

a. homologous