Nitrogen gas returns to the atmosphere by the action of nitrogen fixing bacteria. denitrifying bacteria. nitrifying bacteria. nitrate fertilizers. 15

The sequence of energy flow through a food chain is primary consumers‑ producers‑ higher order consumers. producers‑ higher order consumers‑ primary consumers. higher order consumers‑ primary consumers‑ producers. producers‑ primary consumers‑ higher order consumers.  15

highest order consumers. decomposers. In a terrestrial ecosystem, the trophic level that would contain the largest biomass would be the  producers. primary consumers. secondary consumers. highest order consumers. decomposers.  15

The study of how living things interact is called: Ecosystems Abiotic factors Ecology The Energy Pyramid 10

The source of energy for almost all life on Earth is: Fungi Animals Water Sunlight 15

In an energy pyramid, the bottom level represents: Consumers Producers Scavengers Decomposers 15

An example of a consumer in a pond ecosystem is: Water lily Algae Reed Frog 15

Which of these food chains is in the correct order? caterpillar, cattail, frog, water snake cattail, caterpillar, frog, water snake water snake, frog, caterpillar, cattail cattail, frog, caterpillar, water snake 15

In an energy pyramid, the lowest level has: less energy than the top level less energy than the second level more energy than the top level the same amount of energy as the second level 15

A food chains shows: one possible pathway for energy many possible pathways for energy the amount of energy available to a producer the amount of energy available to a consumer 15

Decomposers are important to ecosystems because they: are at the highest level of the energy pyramid change simple compounds into more complex ones make nutrients available for producers to reuse convert light energy into sugars through photosynthesis 15

Two examples of decomposers are: fungi and bacteria algae and marine mammals carnivores and herbivores ferns and mosses 15

A caterpillar eats a leaf, and a bird eats the caterpillar A caterpillar eats a leaf, and a bird eats the caterpillar. In this interaction, the bird is a: Producer Herbivore Primary consumer Secondary consumer 15

How is a food web model different from a food chain? In a web, energy moves from an organism to only one other. In a web, energy may move to many organisms from one. In a web, an organism gets energy from one source. In a web, an organism receives less energy than in a chain. 15

An unusually cold winter causes the squirrel population to decrease An unusually cold winter causes the squirrel population to decrease. This is an example of temperature as a: Carrying capacity Limiting factor Climax community Pattern in space 15

An animal that eats only plants is a: Primary consumer Secondary consumer Tertiary consumer Primary producer 15

A snake that eats an insect-eating frog is a: Primary consumer Secondary consumer Tertiary consumer Primary producer 15

Which of the following is difference between the nitrogen and carbon cycles? Nitrogen can exist as a solid but carbon cannot. Carbon is released through decomposition but nitrogen is not. Carbon is released through respiration but nitrogen is not. Carbon is cycled through animals but nitrogen is not. 15

Which of the following makes the nitrogen cycle unique? It is the only nutrient cycle without a gas Nitrogen is always only a liquid Nitrogen is found in plants, animals and the soil Nitrogen requires specific bacteria for its cycle 15

Which of the following correctly traces the path of a raindrop through the water cycle? precipitation, run-off, evaporation, condensation precipitation, condensation, run-off, evaporation precipitation, evaporation, run-off, condensation precipitation, evaporation, condensation, run-off 15

Which of the following is a way carbon is added to the atmosphere? Evaporation of water Forest fires Photosynthesis Formation of fossil fuels 15

Why are legumes such as peas and alfalfa considered good for soil? They add valuable humus to the soil when they die and decay. They absorb water and help control runoff. Their leaves are able to photosynthesis at a very high rate. They have nitrogen fixing bacteria in their roots. 15

Where is the oxygen we breathe produced? in the rocks by decaying organisms during photosynthesis as water evaporates 15

What is the major factor that limits the number and types of plants that can grow in Utah? the amount of rainfall we receive the number of people living Utah the types of animals found in Utah the location of Utah on the continent 15

Which of the following is a way carbon dioxide can be removed from the air? building dams fertilizing crops mining coal planting trees 15