Which of the following most likely indicates that a chemical change has happened?
A. A plate breaks when it falls to the floor.
B. There's a loud sound when a jet airplane starts its engines.
C. An icicle melts in the sun.
D. A can is crushed when it is stepped on.

Option B

Explanation:

A plate breaking when falling to the floor would be a physical change, not chemical, as what the plate is created from would not change.

An icicle melting in the sun would be a physical change, as an icicle is frozen water, and after melting it would be normal water.

A can being crushed is still just a physical change, as the material making the can(typically aluminum) has not changed.

When a jet airplane starts its engines, fuel is combusted, creating energy for the engines to start. This would create the loud noise. As fuel is combusted, it turns into different things, henceforth the sound would imply a chemical change has occurred.

meiosis is required for sexual reproduction

the correct answer is option b

behavioral response need communication and thus co-ordination at several levels such as interaction among cells, organ system and the entire organism.

behavioral response produces both internal and environmental stimulus.