How does altering the environmental conditions affect the growth of radish seedlings?

Altering the environmental conditions will affect the growth of radish seedlings. When radish seeds are developed in environments with different light obtainability, seeds that have less light available will exhibit etiolation. Etiolation is regarded as having long pale yellow color stems and small leaves. On the other hand, seeds that have sufficient light available will be sturdier, green and tinier. 

uh two lol

i thinking chemical change