Layer of the atmosphere that contains breathable air and weather:

The air we breathe contains more nitrogen than oxygen.

Layer of the atmosphere that acts as "sunscreen" for the Earth:

The hydrosphere contains all three phases of water.

Part of the hydrosphere that contains water in a solid state:

97% of Earth's water is found in:

The thinnest layer of the geosphere; contains nutrients & fossil fuels:

All living portions of the geo, hydro, & atmosphere make up the:

Life on Earth depends on each of the following, except:

Science that focuses on how organisms interact with the biotic & abiotic components of the environment.

All individuals of the same species in a given area.

All populations of all species in a given area.

Largest & most complex ecological hierarchy:

Red squirrels live in coniferous forests, spend their time searching for nuts/ seeds, & act as a food source for owls. What is their habitat?

Red squirrels live in coniferous forests, spend their time searching for nuts/ seeds, & act as a food source for owls. What is their niche?

Which of the following is not an abiotic factor:

CO₂ + H₂O + Energy => C₆H₁₂O₆ + O₂ is the equation for:

C₆H₁₂O₆ + O₂ => CO₂ + H₂O + energy is the equation for:

CO₂ + H₂O + Energy => C₆H₁₂O₆ + O₂ is the equation for:

C₆H₁₂O₆ + O₂ => CO₂ + H₂O + energy is the equation for:

The carrot in this food chain is an example of a:

The lion in this food chain is an example of a:

Secondary & tertiary consumers are types of:

Decomposers & detritivores are examples of:

The greatest # of individuals that an ecosystem can sustain.

Which of the following are not limiting factors:

Predator-prey interactions usually lead to what adaptation:

Competition between lions and tigers that vie for similar prey:

Competition between grizzly bears occupying the best fishing spots on a river during the salmon spawning season.

More than one species can occupy the same ecological niche at the same place/ time.

No two species can occupy the same ecological niche at the same place/ time:

Sierra finds a tick attached to her scalp. What type of symbiotic relationship is this:

Bacteria in your gut break down foods you cannot normally digest. What type of symbiotic relationship is this:

A population contains more kinds of genes than any single individual within the population.

A population of all the organisms potentially capable of reproducing naturally & having fertile offspring.

Survival of the fittest

Which of the following is not a rule of natural selection:

Of the estimated 500 million species believed to have ever existed on Earth, 98-99% have gone extinct.

Production of new species from previously existing species:

Natural selection is the process that determines

The development of herbicide resistance in populations of weeds over several generations is an example of:

Extinction of organisms is

When a population becomes isolated from another population of the same species over a long period of time:

Grazing animals and the grasses they eat have both evolved in response to each other's influence. This process is known as:

The relationship between frogs and insects is an example of:

Which of the following elements is the most common limiting factor to plants in naturally occurring soil?

Phosphorous is released from rocks by which process?

For producers, carbon enters the carbon cycle in the form of:

Genetic variation among individuals of the same species enables some of these individuals to have a greater chance of obtaining resources and therefore, produce more offspring.

Genes are distinct pieces of DNA that determine the characteristics an individual displays.

Competition between foxes and hawks for the use of mice and rabbits as food is called intraspecific competition.

Symbiotic relationships are those in which organisms live in physical contact with one another.

The niche of an organism is the result of many years of natural selection.

At the highest trophic level, there is less energy and fewer organisms than at the lower levels.

About 50% of photosynthesis activity takes place in fresh water.

Conversion of natural ecosystems to agriculture ecosystems can lead to less ______ stored in soil and large plants such as trees.

Most exotic species are introduced into a new environment accidentally as a result of ________.