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Answer:
cause
The very first hot-air balloon is launched.
effect/cause
Public interest in balloons grows.
effect/cause
Inventors develop hydrogen balloons.
effect
A silk balloon filled with hydrogen is launched.
Explanation: It is 100% right!! Hope it helps!!!!
A cause is a source or producer of effects. An effect is the result or consequence of a cause. The two actions have a cause-and-effect relationship.
What is cause or effect?
A cause is something that produces an event or condition.
An effect is what results from an event or condition. The purpose of the cause-and-effect essay is to determine how various phenomena relate in terms of origins and results.
For more information about cause and effect, refer to the link;
https://brainly.com/question/18234890