Pluto was once classified as a planet. However, scientists no longer classify Pluto as a planet. Which is a likely reason for this change? The original hypothesis about Pluto was supported.
No observations of Pluto were made in the past.
Several planets in outer space were found to be similar to Pluto.
There were significant changes in scientific knowledge about planets.

it is a

explanation:

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.

since there are no options posted i'll give you a few examples.

a dolphin's flipper, bird's wing, cat's leg.