Question

review the science textbook excerpt and then answer the question.
genes and behavior
in the 1940s, behavioral psychologist robert tryon conducted an experiment in which rats were placed in a complex maze that had a food reward at one exit. rats that made fewer errors navigating the maze were bred together to create a \maze - bright colony.\ rats that made more errors were bred together to create a \maze - dull colony.\ after selectively breeding the mice for seven generations, tryon tested offspring from each colony to determine how quickly those rats would learn the maze. offspring of the maze - bright rats consistently made fewer errors than the maze - dull offspring. tyrons research therefore suggests that the ability to navigate the maze successfully was influenced by genes passed from parent to offspring.
which best indicates that the primary audience is biology students?
the writer includes information that only experts would understand.
the writer emphasizes the importance of robert tryons work.
the writer uses straightforward language to explain an experiment about gene selection.
the writer specifically mentions that genes influenced the mices ability to navigate the maze.

Explanation:

• Option 1: Biology students are not experts. So, information only experts understand is not for them.
• Option 2: Emphasizing importance of work alone doesn't indicate audience is biology students.
• Option 3: Using straightforward language to explain a gene - selection (biology - related) experiment is suitable for students (not experts). Biology students need clear explanations.
• Option 4: Mentioning genes influencing maze - navigation is a fact. But it's the way of explanation (straightforward for learning) in Option 3 that indicates the audience.

Answer:

The writer uses straightforward language to explain an experiment about gene selection.