Across
- 5. a hormone that your brain produces in response to darkness.
- 7. nutrients in food that the body uses to build cell membranes, nerve tissue and hormones.
- 9. the pores present on leaves
- 10. the smallest structural and functional unit of an organism, which is typically microscopic and consists of cytoplasm and a nucleus enclosed in a membrane.
Down
- 1. a distinct compound or substance, especially one which has been artificially prepared or purified.
- 2. a chemical element which has the symbol Fe it is also the most common metal on earth
- 3. a chemical element which has the symbol Au In its pure form, it is a bright, slightly orange-yellow, dense, soft, malleable, and ductile metal.
- 4. the main source of energy
- 6. A nutrient that the body needs in small amounts to function and stay healthy
- 8. organ that pumps blood throughout your body. It's the circulatory system's main organ.