The flying beetle known as the firefly or lightning bug is named for its most noticeable feature: its nighttime bioluminescence, or glow. The firefly's light-producing organ contains calcium, the pigment luciferin, the light-producing enzyme luciferase, and the chemical adenosine triphosphate (ATP). When oxygen is added to this mix, it creates light, and the insect glows. Scientists don't fully understand how the firefly makes its light blink, but one theory is that the firefly turns the light on and off by controlling the input of oxygen into the light-producing organ.

Question

The flying beetle known as the firefly or lightning bug is named for its most noticeable feature: its nighttime bioluminescence, or glow. The firefly's light-producing organ contains calcium, the pigment luciferin, the light-producing enzyme luciferase, and the chemical adenosine triphosphate (ATP). When oxygen is added to this mix, it creates light, and the insect glows. Scientists don't fully understand how the firefly makes its light blink, but one theory is that the firefly turns the light on and off by controlling the input of oxygen into the light-producing organ.
Which organizational structure does this text primarily use?
A)Problem-solution 
B)compare-contrast
C)cause-effect

GPT-4o mini · Answer

The text primarily uses a **cause-effect** organizational structure. It explains the components involved in the firefly's bioluminescence and how they work together to produce light, detailing the cause (the chemical reactions involving luciferin, luciferase, ATP, and oxygen) and the effect (the firefly glowing).