Why Aren't There Giant Insects

The video explores why insects today are smaller than their prehistoric counterparts. It discusses theories such as the exoskeleton's weight and oxygen delivery systems as limiting factors for insect growth. Dr. John Harrison suggests that higher oxygen levels in the past allowed for larger insects. While no definitive answers exist, the video concludes with a preference for smaller insects.

What is the largest insect on record mentioned in the video?

• Atlas Moth

• Goliath Beetle

• Mega Nura Dragonfly

• Giant Wetta of New Zealand

Why is the exoskeleton theory considered a 'non-starter' according to Dr. Harrison?

• Exoskeletons are too heavy for large insects.

• Exoskeletons are only found in sea arthropods.

• Exoskeletons dissolve in water.

• There is little data supporting the theory.

How do insects breathe differently from humans?

• By absorbing oxygen through their skin

• By using gills like fish

• Through lungs similar to mammals

• Through a series of holes and air-filled tubes

What was the approximate oxygen level during the late Paleozoic era?

• 32%

• 40%

• 25%

• 21%

What is one reason suggested for the larger size of insects in the past?

• More abundant food sources

• Lack of predators

• Higher atmospheric oxygen levels

• Stronger exoskeletons