| A | B |
|---|
| tissue | group of cells working together |
| organ | group of tissues working together |
| organ system | a group of organs working together |
| organism | anything that can live on its own |
| unicellular | made of a single cell |
| multicellular | made of many cells |
| population | a group of one kind of organism living in the same area |
| community | all the different populations living in one area |
| ecosystem | a community of organisms and the nonliving things around it |
| cell membrane | covering of the cell that keeps things in or out |
| organelles | the structures in a cell that carry out specific jobs |
| cytoplasm | cellular fluid surrounding the organelles |
| nucleus | control center of the cell, holds the DNA |
| prokaryotic cell | has no nucleus; bacteria |
| eukaryotic cell | has a nucleus |
| bacteria | small single-celled organism with no nucleus |
| cell wall | surrounds the cell membrane and gives extra support |
| ribosome | small organelle that makes proteins |
| endoplasmic reticulum | makes lipids, breaks down chemicals, and packages proteins |
| mitochondria | break down food to make energy |
| chloroplast | green structure in plant cells that turns sunlight into energy |
| golgi complex | changes, packages, and transports materials out of the cell |
| vesicle | forms from part of the cell membrane to allow materials to enter |
| vacuole | large storage container in plant cells |
| lysosome | digests food, wastes, and foreign invaders |
