Question

name ______________________ date ___________
student exploration: pond ecosystem
vocabulary: abiotic factor, algal bloom, biotic factor, concentration, eutrophication, mean, oxygen, parts per million, photosynthesis
prior knowledge questions (do these before using the gizmo.)

1. all animals need oxygen. we get oxygen from the air we breathe. how do fish get theirs?

_________________________________________________________________________
_________________________________________________________________________

1. where does the “fizz” in soda come from?

_________________________________________________________________________
_________________________________________________________________________
gizmo warm-up
the pond ecosystem gizmo lets you study ponds as
an ecologist would. each of the tools can be dragged
to the pond to take measurements.

1. drag the thermometer to the pond at 8:00 am

image: a thermometer showing 26 °c, a red barn, trees, and mountains in the background

Explanation:

Question 1:

Fish obtain oxygen from water. Water contains dissolved oxygen, and fish use their gills to extract this dissolved oxygen from the water as it flows over the gill filaments. The gills have a large surface area and a network of blood vessels that allow for the diffusion of oxygen from the water into the fish's bloodstream and carbon dioxide out of the bloodstream into the water.

The "fizz" in soda (carbonated beverages) comes from carbon dioxide ($\ce{CO_2}$) gas that is dissolved in the liquid under high pressure during the carbonation process. When the pressure is released (e.g., when you open the bottle or can), the dissolved carbon dioxide comes out of the solution in the form of bubbles, creating the fizz.

Answer:

Fish get oxygen from the dissolved oxygen in water, which they extract using their gills.

Question 2: