The brain develops extremely quickly in the first few years, but not all of this growth is permanent. Rapid and temporary dendrite growth is called "."

more words for this could be abiotic and biotic

abiotic: living organisms within an ecosystem

biotic: non-living organisms within an ecosystem

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

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

you can have just about every answer you can think of

if someone had the list of traits you provided