Science

4. - The variety of life in a particular habitat or ecosystem.
6. - Two or more atoms bonded together.
7. - A microscopic infectious agent that replicates inside the cells of living organisms.
9. - The smallest structural and functional unit of an organism.
15. - The process by which two atomic nuclei combine to form a heavier nucleus.
16. - Variants of a chemical element that have the same number of protons but different numbers of neutrons.
17. hole - A region in space where gravity is so strong that nothing, not even light, can escape.
18. - The green pigment in plants that absorbs light for photosynthesis.
19. - A substance that donates protons (hydrogen ions) and has a pH less than 7.
21. - A subatomic particle with no electric charge found in the nucleus of an atom.
24. - A negatively charged subatomic particle that orbits the nucleus of an atom.
25. - A protein produced by the immune system to neutralize pathogens.
27. - The minimum amount of energy that can be gained or lost by an atom.
28. - The movement of water molecules through a semipermeable membrane.
29. - A unit of heredity that is passed from parent to offspring.

1. - The process by which plants convert sunlight into energy.
2. - The force that attracts objects with mass toward each other.
3. - The preserved remains or traces of ancient organisms.
5. - A change in the genetic sequence of an organism.
8. - A nerve cell responsible for transmitting electrical signals in the body.
10. - A community of living organisms interacting with their environment.
11. - The gradual development of organisms over time.
12. - The speed of something in a given direction.
13. - The energy an object possesses due to its motion.
14. - Relating to the structure of the Earth's crust and the movement of its plates.
20. - The molecule that carries genetic information in living organisms.
22. - The process of transformation in an organism's life cycle, such as a caterpillar turning into a butterfly.
23. - The resistance of any physical object to a change in its motion.
25. - The basic unit of matter, consisting of protons, neutrons, and electrons.
26. - A machine that converts kinetic energy from fluid (air or water) into mechanical energy.