IXL Learning Product Analyst - Science interview questions

I applied online and got an email request for a phone screen. The interviewer was also a product analyst for Math. Nothing out of the ordinary. In general, I got the feeling that he didn't really care about the interview and was just going through the motions. I asked about the next step in the process, He told me I will hear from them in a week. The whole interview was less than 30 mins. I got an email response in a couple of days.

Applied online via their website, heard back from recruiting about 3 1/2 weeks later and arranged a phone interview that took place a week afterward. The phone interview was with a Product Manager, and lasted around 30 minutes. The first part of the interview consisted of standard interview questions (why do you want to work here, why do your qualifications fit the position). The second part consisted of questions meant to test your abilities in logic and explanation. See the question below for the former. The latter was an impromptu lecture at an elementary/middle school level on a scientific topic of your choice. After the interview, I was given one week to complete an assignment representative of the type of work a product analyst would do - writing age-appropriate explanations for questions and creating an abstract high-level design for a "problem generator" program. (The program generator is IXL's method of procedurally generating a large number of questions testing the same concept). After completing the assignment, I was informed that I would not be moving on in the interview process.