Cells are the basic unit of all living things. The different parts of cells include:
Protoplasm - consists of cytoplasm and nucleus
Cytoplasm - jelly like substance where chemical reactions take place and other parts are embedded
Nucleus - controls reproduction and also contains the characteristics of the cell
Cell membrane - surrounds the cell and controls what moves in and out of the cell
Mitochondria - found only in plant cells where respiration occurs
Chloroplasts - make plants green. Contain chlorophyll which is needed for photosynthesis
Cell wall - gives the cell its shape. The cell "skeleton"
Vacuoles - where the cell sap is stored

Plant cell
Chlorophyll in chloroplasts
Cellulose cell wall
Large vacuoles

Animal cell
No Chlorophyll or chloroplasts
No Cellulose cell wall
Small or no vacuoles

Tissues
Made up of lots of cells of the same type. e.g. muscle tissue is made up of many muscle cells

Organs
Different tissues working together to carry out a certain function. An organ can contain different types of tissue e.g. the heart