Cells

4. the positively charged central core of an atom, consisting of protons and neutrons and containing nearly all its mass.
6. a vacuole with a digestive function in the protoplasm of a protozoan.
7. the smallest structural and functional unit of an organism
9. the bodily movement of a motile organism in response to light, either toward the source of light or away from it
10. (in green plant cells) a plastid that contains chlorophyll and in which photosynthesis takes place.

1. the central and most important part of an object, movement, or group, forming the basis for its activity and growth.
2. any of a group of spore-producing organisms feeding on organic matter,
3. a unicellular organism that has the ability to change its shape.
5. tiny, single-celled living organisms.
8. vacuole a vacuole in some protozoans which expels excess liquid on contraction.