What Development Led to the Emergence of the Modern Skyscraper

question 9

Multiple Choice

What development led to the emergence of the modern skyscraper in the 1890s?

• A) The invention of the elevator
• B) The advent of structural steel
• C) The decline of corporate power
• D) The advent of cast iron

---

Definitions:

Iris

The colored part of the eye that controls the size of the pupil and thus the amount of light that enters the eye.

Cornea

The clear front section of the eye, encompassing the iris, pupil, and front chamber, which plays a primary role in concentrating the majority of light entering the eye.

Retina

A thin layer of tissue at the back of the eye that contains cells sensitive to light, which convert light into neural signals for visual recognition.

Visual Receptors

Cells in the eye, specifically rods and cones, that respond to light and enable vision.