Biology

1. Powerhouse of the cell
3. Cell organelle that stores materials such as water, salts, proteins, and carbohydrates
5. Control center of the cell
7. The basic unit of structure and function in living things
13. A type of protein that speeds up a chemical reaction in a living thing
15. A group of ecosystems that share similar climates and typical organisms
16. Energy-requiring process that moves material across a cell membrane against a concentration difference
18. fertilized egg cell
20. Movement of molecules from an area of higher concentration to an area of lower concentration.

2. An organism's particular role in an ecosystem, or how it makes its living.
4. An organism's physical appearance, or visible traits.
6. the struggle between organisms to survive in a habitat with limited resources
8. Energy-rich organic compounds, such as fats, oils, and waxes, that are made of carbon, hydrogen, and oxygen.
9. Any difference between individuals of the same species.
10. An organism or cell having only one complete set of chromosomes.
11. A close relationship between two species that benefits at least one of the species.
12. Cell division that produces reproductive cells in sexually reproducing organisms
14. A segment of DNA on a chromosome that codes for a specific trait
17. single-stranded nucleic acid that contains the sugar ribose
19. A biological community of interacting organisms and their physical environment.