Use the Following to Answer Questions

question 18

Multiple Choice

Use the following to answer questions :
Refer to the figure below showing a stage in limb development in a human embryo.
-The substance secreted by the ZPA is _______ and the concentration of this is lowest at the region labeled _______.

• A) the protein Sonic hedgehog;2
• B) the Shh gene;2
• C) the transcription factor that turns on the Shh gene;1
• D) the ZPA1 protein;2
• E) the protein product of the zone of polarizing activity;1

---

Definitions:

Online Social Network

A digital platform that allows users to create profiles, share content, and interact with others, fostering social connections and communities.

Recommendations

Suggestions or advice given based on analysis or expertise, often found in reports or reviews.

Online Brand

The digital identity and reputation of a company or individual, shaped by their online presence and activities.

Performance Reviews

Evaluations or assessments of an employee's work performance over a specific period.