Cell membrane: a thin flexible Barrier that surrounds a cell and controls which substances pass into and out if a cell

Cell wall: a ridged supporting layer that surrounds the cells of plants and other organisms

Organelle: a tiny cell structure that carries out a specific function within the cell

Tissue:  type of structure material

Unicellular: made of single cell

Multicellular: consisting of many cells

Autotroph: an organism that is able to capture energy from sunlight or chemicals and use it produce it's own food.

Heterotroph: an organism that cannot make it's own food and gets food by consuming other living things.

Prokaryotic: A unicellular organism that lacks nucleus and some other cells

Eukaryotic:  an organism with cells that contains nucleus.

cell: The basic unit of organizing and function in living things

Organ: a collection of different tissues joined in structural unit to serve a common function