Matter in the plasma state have a variable volume and shape. Plasma contains ions and electrons , both of which can move around freely.
C. Makes the most sense to me
The Inner layer of tissue is used for digestion.
Answer:
For several months, weighing and measuring the pups every week
Explanation:
This is to control variables and keep a measurable set of data that can prove or disprove the theory they had developed, and also to isolate cases that can't be attributed to the experiment they had carried out, like puppies loosing weight due to illnesses, or behavioral factors.
