How Many Countries Are in the European Union

question 12

Multiple Choice

How many countries are in the European Union?

• A)28
• B)6
• C)21
• D)17

---

Definitions:

Light-sensitive Spots

Simple photoreceptors found in some organisms that can detect the presence of light but cannot form images.

Compound Eye

A type of eye found in insects and some crustaceans, consisting of multiple small visual units that provide a wide field of vision and the ability to detect movement.

Camera Eye

An eye type that possesses a lens for focusing light on the retina, similar to the operational principle of a camera, found in humans and other animals.

Regulatory Mutations

Genetic mutations that affect the regulation of gene expression, potentially leading to changes in the timing, location, and amount of gene product being produced.