1) A______is a network of relationships among components that interact with and influence one another through the exchange of energy, water and information.

2) Which of the following specifically contains all of the planet's living organisms and nonliving parts of the environment in which they interact?

3) The______contains the rock and sediments beneath earth's surface in the planet's uppermost layers.

4)The process of nutrient over-enrichment, oxygen depletion in the bottom layers of water, increased production of organic matter, and subsequent ecosystem degradation is known as_____.

5) Positively charged particles in atoms are called_____.

6) What kind of bond is formed between two atoms that lack an electrical charge and therefore share electrons?

7) Ammonia would be considered a _____solution.

8) Lemon juice would most likely be considered a _____solution.

9) Which of the following polymers help in producing tissues and structural support, serve as enzymes, and even help to store energy and transport substances?

10) Glucose is broken down into water and carbon dioxide through________.

11) This law states that energy will naturally change from an ordered state to increasing disorder or entropy.

12) Most green plants, algae, and cyanobacteria are known as______.

13) The biogeochemical cycle plays an important part by________.

14.) Evaporation, precipitation, transpiration, and infiltration are all processes in the ________cycle.

15.) What cycle is being interrupted through the burning of fields and forests?