Because in science, "theory" doesnt mean what it means in everyday language. Scientific knowledge is known as theory. For example, electrical theory, germ theory, evolutionary theory, thermal theory, etc
A) nucleus
Stores genetic information
B) cytoskeleton
Provides support
C) cytoplasm
Regulates transport
D) Golgi apparatus
Processes proteins
E) lysosome
Breakdown and recycle
F) flagellum
Movement
G) mitochondria
Energy harvest