COUN 5100 Lecture Notes - Null Hypothesis, Experiment, Alternative Hypothesis

What type of hypothesis posits a difference between groups where the difference is not specified?

What type of hypothesis posits a difference between groups where the difference is specified?

This question is from my biology that is talking about (Dominance and aggression in animal social groups)

for the following question is asking me to state hypothesis,predictions and rationale study about what factors drives dominanceranks in crayfish social groups?

I need simple hypothesis following with simple predictions andhypothesis