nucleus: controls the activities of the cell
cytoplasm: controls the chemical reactions in the cell
ribosomes: protien synthesis happens there
mitochondria: most energy used in respiration is from here
cell membrane: controls the substances that go in and out the cell
cell wall: found in plant cells, strengthens the cell
vacuole: filled with cell sap, keeps it turgid
chloroplasts: contain chlorophyll used for photosynthesis
DIFFUSION: high concentration-low concentration
its when particles spread and it happens between dissolved substances.
e.g. smell of cooking travelling around a room.