Final answer:
Immature ephemeroptera can be distinguished from immature odonata based on their physical characteristics such as the number and shape of their tails and the presence of gills.
Step-by-step explanation:
Immature ephemeroptera and immature odonata can be distinguished from each other based on their physical characteristics. Ephemeroptera, also known as mayflies, have three long and slender tails, while odonata, including dragonflies and damselflies, have shorter but sturdier tails. Additionally, the nymphs of ephemeroptera have gills on the sides of their abdomen, whereas the nymphs of odonata have rectal gills.
Learn more about Physical characteristics of immature ephemeroptera and odonata