Which Labeled Structure in the Figure Is Precapillary Sphincter

question 13

Multiple Choice

Which labeled structure in the figure is precapillary sphincter?

• A)A
• B)B
• C)C
• D)D

---

Definitions:

Gene Recruitment

The evolutionary process by which a gene acquires a new function.

Complex Adaptation

A complex adaptation is a suite of coexpressed traits that together experience selection for a common function. Phenotypes are considered complex when they are influenced by many environmental and genetic factors and when multiple components must be expressed together for the trait to function.

Citrate Exploit

The ability of certain bacteria, specifically strains of E. coli in experimental evolution, to utilize citrate as a carbon source under aerobic conditions where they typically cannot.