What is the primary structural component of fungal cell walls?

A researcher finds a correlation between watching violent TV and physical aggression, but knows she can’t conclude that TV causes aggression because aggressive children could also choose to watch more violent TV. The problem being illustrated here is called:

Which of the following phrases would indicate that a researcher is making a causal claim?

How do mycorrhizal fungi benefit plants? 

1. Match the following terms and their equations or definitions. (Some items in the dropdown may not be used) 

Researchers showed therapists a video of young man whom they labeled as a “patient” or a “job candidate.” Those who were given the label “patient” were more likely to interpret the man’s neutral responses as “tight and defensive.” These differences in responses best illustrate what drawback to behavioral data?

Dr. Ellison finds a relation between children’s levels of sleep (reported in hours by the parent) and performance on two problem solving tasks. Dr. Ellison finds children having a higher amount of sleep is associated with higher scores on the two problem solving tasks. What type of correlation is being illustrated?

Nielsen Media Firms uses its “TV boxes” to record families’ TV habits. Every year, they report the average number of hours families spend watching TV. The most recent report showed that families watch an average of five hours and four minutes of TV per day. This is an example of:

Which characteristic is unique to viruses among biological entities? 

Sheila wants to conduct a study that allows her to make a causal claim. What type of study does she need to use?