Take a deep breath in, take a deep breath out. Most of the gas that just passed through your mouth was... (what most of the air is made of)

The burning of fossil fuels by cars and factories has most affected the ______________ cycle.

All living things use nitrogen to

An aquatic food web consists of phytoplankton → krill → seals → sharks. The removal of which component is MOST LIKELY to cause an immediate impact on the food web?

The process of respiration is essential in the oxygen/carbon dioxide cycle. Respiration removes ______ from the atmosphere and produces and releases ______ to the atmosphere.

The snake that eats the frog in this food chain is called a

Consider the model of the food chain. Imagine a local farm has dumped excess pesticides in the pond used for irrigation. This will impact the food chain in the pond in ALL BUT ONE way. That is

A food web shows who eats who in any given habitat. Every living thing, from one-celled algae to giant blue whales, needs food to survive. Each food web is a possible pathway that energy and matter can follow through the habitat. A food web begins with producers: organisms that convert sunlight into usable chemical energy. The food web is completed by the decomposers who turn organic wastes, such as decaying plants, into inorganic materials, such as nutrient-rich soil. Decomposers complete the cycle of life, returning nutrients to the soil or oceans for use by producers.

In this food web, identify the decomposer.

Which is an accurate description of the growth of a natural animal population?

In most ecosystems, nitrogen is primarily stored in living and dead organic matter. This nitrogen must be chemically modified from ammonia (NH₃ ) to ammonium salts (NH⁴⁺ ) in the soil, so that it may be once again incorporated into plant tissues. This conversion is carried out by bacteria and fungi through the process of

In order for matter to recycle and return in the food chain shown here, what must be present at level A?

Look at the diagram of the food web. Fungi and bacteria are at the bottom of the food web.What would MOST LIKELY happen to the grass if most of the fungi and bacteria die?

Maria's subdivision has a lot of little brown rabbits. In the years past, you could see them in the morning or at dusk just as the sun was setting. Now Maria and her family see them hopping around in the middle of the afternoon and they keep coming into her garage. Everyone seems to think there are more rabbits than ever this year. What could be a reason for the overabundance of the rabbit population?

All living things within an ecosystem are interdependent. A change in the size of one population affects all other organisms within the ecosystem. One well known predator/prey relationship is between ladybugs (predator) and aphids (prey). What happens to the population of ladybugs if there is an increase in aphids?

All living things within an ecosystem are interdependent. A change in the size of one population affects the stability of all other organisms within the ecosystem. One well known predator/prey relationship is between the Canadian lynx (predator) and the snowshoe hare (prey). What happens to the population of Canadian lynx if there is an increase in snowshoe hare?

All living things within an ecosystem are interdependent. A change in the size of one population affects all other organisms within the ecosystem. One well known predator/prey relationship is between Canadian lynx and snowshoe hare. Examine the graph and develop a logical conclusion regarding the population of Canadian lynx if there is an decrease in snowshoe hare population.

This is a typical grassland food web. It is also a small picture of an important cycle on Earth: the carbon cycle. Explain how the carbon gets into this food web.

Man can impact the carbon cycle in a negative way. What conclusion would NOT negatively impact the carbon cycle.

Think about the transfer of energy within any ecosystem. Which statement provides the best predictable outcome if the Sun no longer provided light for Earth?