Science

2. geographic region with common flora and fauna with a singular climate
5. A secreted or excreted chemical factor that triggers a social response in members of the same species.
7. the element with atomic number 89
8. Radiation emitted by the acceleration of unbound charged particles
9. process of making ammonia
12. sort of ear problem caused by the damage done by high underwater pressure on the air pocket in the middle ear.
14. An organic compound with chemical formula CO(NH2)2.
15. an organism with cells containing a true nucleus
17. A variant of a particular chemical element.
18. SI unit for measuring radiation dose
20. Matter emitting visible light as a result of high temperature

1. method of separating mixtures by removing the liquid layer from a precipitate.
3. An inconspicuous appearance adopted by an organism in order to deceive possible predators or prey
4. representation of a molecule that uses dots to show electrons around atoms and lines to show covalent bonds
6. A substance that lowers the activation energy of a specific reaction by providing an alternate reaction pathway
10. species that can both accept and donate a proton or hydrogen ion.
11. A fold in the inner membrane of a mitochondrion
13. makes things stick together.
16. device that converts energy from one form to another.
19. Stage of cell division when the chromosomes separate to each side of a cell