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

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i believe the answer is: b. mr. head had a long, tube-like face with a rounded open jaw and a short depressed nose.

this is because in the un-revised sentence it said that mr. heads face was long and tube-like, and he had a rounded open jaw. this is not a very grammatically correct because of how it seems to drag on with the and, replaced with, with, makes it sound more fluent in the description.

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is there any anwser chocies