An experiment where one and only one variable is changed.
What is a controlled experiment?
The most shrimp were observed in cups that had this range of salt spoons.
What is 2-4 spoons?
Everything that surrounds and influences an organism.
What is an environment?
In a food chain, the energy starts with this nonliving factor.
What is the sun?

The two preferences we tested isopods for were...
What are moisture and brightness?
The amount of salt in water is called this.
Salinity
Mealworms molt so they can do this.
What is grow?
In an ecosystems, there are ________ between the organisms and with the nonliving factors.
What are interactions?
Moisture level is one example of an __________ __________.
What is an environmental factor.
Before our bodies react to something picked up by our sense organs, it has to go through this other structure.
What is your brain?
A pill bug leaves a sunny, dry patch of soil to find a dark, moist patch of soil. The dark, moist soil is its ______________ _____________.
What is preferred environment?
This group of critters likes moist or wet soil because of their gill-like structures.
What are isopods?
A snake is stalking a mouse and is about to gobble it up, when a hawk swoops down, snatches the mouse, and carries it away to eat. The snake and the hawk are _______________ for the same food.
What is competing?
These are two possible nonliving environmental factors in a terrarium.
What are soil and water?
What are rocks and nutrients?
What are air and soil?
Which color "critter" would you expect to have the largest population next year?
What is beige/tan/brown?
Another word for the jobs that an organism's body part does.
What are functions?
Mildly salty water (2 spoons) for brine shrimp would be their __________ environment.
What is optimum?
The arrows in a food chain and food web indicate the direction in which matter and _______ move.
What is energy?
Your eyes and ears, a beetle's antennae, and a snail's tentacles are all examples of structures that let you ___________.

What is sense?
A student conducts an experiment to test the food preferences of mealworms. He concludes that mealworms prefer rice flour over wheat bran. His classmate disagrees with him, and says that he should've done this in his experiment.
What is use only one temperature for both foods?
Oxygen that's dissolved in water is an example of a ____________ factor in an aquarium.
What is nonliving?
In a freshwater aquarium, snails can act as _________ by consuming pieces of uneaten food, feces, and other debris that would otherwise collect in the water.

What are decomposers?
In the food web below, if the frog population suddenly increased, which organisms would be most likely to decrease right away?

What are snails and grasshoppers?
These are the three different types of consumers. They are classified by whether they eat producers or consumers.
What are herbivores, carnivores, and omnivores?
A student studied brine shrimp hatching under a range of saltwater conditions. He organized his results on the graph you see here.What is the range of tolerance for hatching brine shrimp?

What is 3 to 7 spoons?