I can’t give you a specific answer because I’m not sure what your lab is. However, an independent variable is the variable that is changed, the dependent variable is the variable that is affected by the change, and the constant variables are those which remain the same throughout the entire experiment.
The change is harsh on birds. Food supplies goes down and birds can become ill from the disease
Sea star
explanation: a marine invertebrate of the phylum Echinodermata, such as a starfish, sea urchin, or sea cucumber.