1. which of the following steps is an important part of the process by which ecology guides humans to a sustainable future? a. behavior is changed after the cause of the problem is identified. b. the causes behind problems aren't identified or studied. c. the problems plaguing ecology are ignored. d. behavior remains unchanged after the root of a problem is identified. 2. which of the following accurately describes the ph scale? a. the lower the concentration of hydrogen ions, the higher the acidity is. b. the greater the ph is, the lower the acidity is. c. the lower the ph is, the more basic the solution is. d. the greater the concentration of hydroxide ions, the higher the acidity is. 3. which of the following does not accurately depict a scientific theory? a. theories are tested over and over again. b. theories may be changed or replaced if new evidence is found. c. theories are absolute truths. d. theories are supported in many ways. 4. which of the following is not a part of the peer review process or its result? a. allowing scientists to share ideas through published work b. enabling scientists to review each other's work in publications c. making sure that a piece of work is correct and includes bias d. ensuring that work meets the standards of the scientific community 5. unlike ionic bonds, covalent bonds involve the a. loss of one or more electrons from one atom to another. b. gain of one or more electrons by one atom from another. c. development of positively and negatively charged ions. d. sharing of electrons between atoms. 6. unlike an animal's habitat, an animal's niche can be described by all of the following except a. the way the species obtains what it needs to reproduce. b. the way the species obtains what it needs to survive. c. the place in which the species lives. d. the job the organism has within its environment. 7. within a single use of the scientific method, which of the following steps can only be performed after data is collected? a. controls and variables are chosen. b. the initial hypothesis is formed. c. the initial experiment is designed. d. conclusions are drawn. 8. which of the following can be said about the use of agriculture? a. it has included practices that led to pollution of soil and water. b. it stunted the growth of civilization and development. c. it bears no effect on the environment. d. it prohibited the use of machinery. 9. the main reason that it's important to test only one variable at a time is so that a. quantitative data can be recorded. b. scientists can have many hypotheses tested at once. c. scientists can easily tell which variable caused the results. d. qualitative data can be recorded. 10. unlike life at the top of a body of water, life at the bottom of the body of water a. must rely on other means than photosynthesis. b. receives much more exposure to light. c. performs much more photosynthesis. d. is affected by temperature and nutrient availability.