There Are Crystal Mirrors Hidden in Scallop Eyes

The video explores the complex visual system of scallops, which have up to 200 telescope-like eyes using mirrors made of guanine crystals to focus light. These eyes have two retinas, allowing scallops to see two images simultaneously. The video also discusses a recent study suggesting sponges, not comb jellies, are the earliest branch on the animal evolutionary tree, based on genomic analysis and statistical filtering.

What unique feature do scallop eyes have that is similar to telescopes?

• They use lenses to focus light.

• They use mirrors made of guanine crystals.

• They have a single retina.

• They are the largest eyes in the animal kingdom.

How do scallop eyes differ from human eyes in terms of retina placement?

• Scallop eyes have retinas at the back like humans.

• Scallop eyes have retinas on the sides.

• Scallop eyes have two retinas in the middle of the eye.

• Scallop eyes have no retinas.

What is the primary function of the outer retina in scallop eyes?

• To provide night vision.

• To focus on distant objects.

• To detect colors.

• To detect quick changes in light.

Which group of animals is now considered the sister group to all others according to recent studies?

• Corals

• Comb jellies

• Sponges

• Jellyfish

What was the main method used to determine the sister group of all animals?

• Observing physical characteristics

• Analyzing fossil records

• Comparing genomes and using computer models

• Studying animal behavior