***An organism that cannot make its own food is called

***Which is true regarding the organization of an ecosystem?

***Only 10% of the energy stored in an organism can be passed on to the next trophic level. Of the remaining 90% of energy, some is used for life's processes and the rest is

***The lowest level of environmental complexity that includes biotic and abiotic factors is the

***An organism's niche is

***Each of the following is an abiotic factor in the environment except

***The simplest grouping of more than one kind of organism in the biosphere is called

***An organism that uses energy to produce its own food supply from inorganic compounds is called

***What animals eat both producers and consumers?

***An interaction in which one organism hunts, captures, and feeds on another organism is called

***All of the interconnected feeding relationships in an ecosystem make up a food

***A snake that eats a frog that has eaten an insect that fed on a plant is a

***The combined portion of earth in which all living things exist is called the

***All of the members of a particular species that live in one area are called a

***In an ecosystem, which is the most likely reason for an increase in the producer population if there is an increase in the carnivore population?

**A scientists tests different types of fertilizer to determine which would produce more flowers on a rose bush. Which hypothesis is the best choice?

***Which sequence shows increasing ecological levels of organization?

***Some birds live in close association with horses. These birds feed on insects that are parasites to horses. Which type of relationship between the horses and birds does this illustrate?

***A symbiotic relationship in which one organism benefits and the other is harmed is known as

*****The three particles that make an atom are

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