Answer:
Physical adaptations do not develop during an individual animal's life, but over many generations. The shape of a bird's beak, the color of a mammal's fur, the thickness or thinness of the fur, the shape of the nose or ears are all examples of physical adaptations which help different animals survive.
Stem cells are unique in the fact that they can replicate any type of cell and their function. They help in cases of disease and injury because the replication properties can also be applied to white blood cells; these are cells that destroy pathogens.
Contents of the model cell will change color.
hope this helps
The independent variable is whatever you're changing
