In a food chain, the arrows point:

From the organism eaten to the organism that eats it (the direction energy flows)

Which statement correctly contrasts energy and matter in an ecosystem?

Energy flows one way and is lost; matter cycles and is reused

An invasive species reducing biodiversity

12questions. Pick an answer and you'll see why right away.

Which level of ecological organization includes all the living things plus the non-living environment in an area?
A study tracks all the bluegill fish in one pond over several years. Which level of organization is this?
Which of these is an abiotic factor in a pond?
In a food chain, the arrows point:
Producers store 10,000 units of energy. Using the ten percent rule, about how much reaches a secondary consumer?
Which statement correctly contrasts energy and matter in an ecosystem?
In the carbon cycle, which process removes carbon dioxide from the atmosphere?
Plants cannot use nitrogen gas directly. Which organisms convert it into a usable form?
A population grows quickly, then levels off and stays near 500. What does the level at 500 represent?
Which is a density-dependent limiting factor?
A tapeworm lives in a dog's intestine and takes its nutrients, harming the dog. This relationship is:
A non-native fish with no local predators spreads through a lake and eats native fish eggs. This is best described as: