Question

daves friends call him \heartbeat.\ dave thinks he looks like he is 11 years old. dave tries to gain weight. dave wears extra layers to look bigger. dave thinks his nickname is accurate. internal conflict external conflict

Explanation:

Internal conflict is a struggle within a character's mind. External conflict is between a character and an outside force. Dave thinking he looks 11 is an internal perception. Gaining weight and wearing extra - layers are actions to deal with his self - perception (internal). Thinking his nickname is accurate is also an internal thought.

Answer:

Dave's friends call him "Heartbeat.": Internal Conflict
Dave thinks he looks like he is 11 years old.: Internal Conflict
Dave tries to gain weight.: Internal Conflict
Dave wears extra layers to look bigger.: Internal Conflict
Dave thinks his nickname is accurate.: Internal Conflict