Ava noticed that bubbles started to form and rise upwards only after she unscrewed the cap. She then opened another bottle that was much colder, and she noticed that a lot more bubbles had formed. Explain what Ava observed.

d

explanation:

gasoline is a mixture. it contains several different kinds of compounds that can be present in a variety of ratios.

d : a person who learns about the world by observing it. no that is not a smiley face

explanation:

it was spontaneous.

"ain't i a woman? " is the name given to a speech, delivered extemporaneously, by sojourner truth, (1797–1883), born into slavery in new york state.sojourner truth' delivered her famous speech "ain't i a woman? " (which did not have a title at that moment) was given without any previous preparation. her dissertation took place at the women's convention in akron, ohio, in 1851.