Prehistoric Dragonflies

What was the approximate wingspan of Meganeura?

• 1 foot

• 2.5 feet

• 4 feet

• 6 inches

What factor contributed to the unusually large size of prehistoric insects like Meganeura?

• Lower atmospheric pressure

• Abundant food sources

• Higher oxygen levels in the atmosphere

• Lack of predators

How did Meganeura's flight compare to modern dragonflies?

• It was quicker and more nimble.

• It had a much higher wing flap frequency.

• It sustained flight more like a modern bird than an insect.

• Its wings were less powerful and lacked cross-braces.

What did adult Meganeura primarily prey on?

• Large mammals

• Lesser insects and amphibians

• Fish and aquatic insects

• Plant matter

What was the primary reason Meganeura could grow to such enormous sizes during prehistoric times?

• Abundant food sources.

• Lack of predators.

• Higher oxygen levels in the atmosphere.

• Lower atmospheric pressure.

Besides facilitating breathing, what alternative reason does newer research suggest for Meganeura's enormous size?

• To better camouflage themselves from predators.

• To store more energy for long flights.

• To avoid oxygen poisoning from the rich atmosphere.

• To attract mates more effectively.

Which of the following factors is NOT cited as a reason for the extinction or decline of Meganeura?

• A decrease in atmospheric oxygen levels.

• Increased competition from early flying dinosaurs.

• The Permian extinction event.

• A sudden increase in global temperatures.