Use this chart of a portion of a dichotomous key to answer the question.
dichotomous key
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which question distinguishes organism x from organism z?

The kind of fertilization found in the majority of aquatic animals is (internal or external) fertilization.

When is your respiration rate likely to change? a. when your intestines are digesting b. when your cells have too much glucose c. when your cells need more oxygen d. when your liver is working after a meal

As a result of wildfires, in grasslands. a) tree growth increases b) grass growth increases c) soil quality decreases d) invertebrate variety decreases