Here are the answers to your questions:
Question 1: This question appears to list different orders of insects or arthropods, but you haven't provided enough context to choose the correct answer. If you can provide a specific context (like which group you are asking about), I can help you further.
Question 2: The options describe various characteristics that could be used to differentiate between groups of animals (likely aquatic). The right answer depends on the specific groups being compared, but in a general sense:
- a (Eyes on side of head vs. Eyes on top of head) is likely differentiating fish from other aquatic creatures.
- b (Mouth at front vs. Mouth on underside) also likely differentiates types of fish or aquatic species.
- c (One set of dorsal fins vs. Two sets of dorsal fins) is about fish types.
- d (Rounded caudal fin vs. Forked caudal fin) again distinguishes between fish types. For proper answers, more context would be necessary.
Question 3:
- b (2). A dichotomous question typically has two contrasting options or alternatives.
Question 4: This is the same as Question 3. The answer remains b (2).
Question 5:
- b (Identify living organisms). A dichotomous key is primarily used for the identification of organisms based on their characteristics.
Feel free to provide more context or additional questions!