A:he has made observations about the natural world b. justin notices a particular type of caterpillar feeds only on cottonwood trees in his neighborhood. in which way has justin increased his scientific knowledge? he has used technology. c he has performed a practical experiment. d he has performed an unethical experiment.

The correct answer of the given question above would be option B. The way which Justin increased his scientific knowledge is when he notices a particular type of caterpillar feeds only on cottonwood trees in his neighborhood. Scientific knowledge is the knowledge acquired with the use of the scientific method particularly observation and experimentation.