ACTIVITY NUMBER 2

3. these reactions build up bigger molecules from smaller ones.
5. This is where life operates.
7. What is the study of the interactions between life and its physical environment.
9. A suggested explanation based on evidence that can be tested by observation or experimentation.
10. A solution with a pH higher than 7.
13. a substance that starts a chemical reaction
14. are chemical reactions that take place inside the cells of living things
16. it is a ability to do work.
17. comprises all types of water resources oceans, seas, lakes, rivers, streams, reservoir, polar icecaps, glaciers, and ground water.
20. a substance that forms as a result of a chemical reaction
22. It seek to understand natural world
26. the sum of all the biochemical reactions in an organism
27. The act of noting or detecting phenomenon by the senses.
28. is the smallest particle of an element that still has the properties of that element
29. What is the concentration of hydronium ions in a solution

1. it is a s a common chemical substance on planet Earth.
2. examine, gain new knowledge, or build on previous knowledge about phenomena.
4. A solution with a pH lower than 7.
6. What is living things in science?
8. is done when force is applied to an object over a distance
11. A widely accepted hypothesis that stands the test of time.
12. Any moving object has kinetic energy or energy of motion, and it thus can-do work.
15. What is Environmental geology and soil sciences
18. is anything that takes up space and has mass.
19. organized body of knowledge that is obtained by study and experimentation.
20. it has a low concentration of hydronium ions making it essentially neutral
21. is the study of energy
23. A test that is used to rule out a hypothesis or validate something already known.
24. is the main element in organic compounds, so carbon is essential to life on Earth
25. The vast majority of our people directly dependent on the nature resources of their country for their basic needs