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?
compare-contrast
cause-effect
No