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.
I think the answer is C. None of the other animals are mammals.
Answer: skeletal system
Explanation: osteoarthritis affects the cartilages of Bones.cartilages is a flexible connective tissue ,in a joint that covers the surface of the bones in the joint.it also cushions the bones from impact.
During osteoarthritis,the cartilages wears out and causes the bones in the joint to rub against each other causing swollen joints, painful joints and stiffness of joints
It occurs in joints of the knees,hips,fingers and toes.
