Answer:
All organ system(s) are important for proper functioning of the organism but I think Circulatory System is the most important one...!
Explanation:
Because the organism will die without proper blood circulation...!
D : the shape of a solid does not change when it is put into a container
Answer:
They may change due to environmental changes. for example, if a cactus suddenly experiences a drought, it may change to become better at holding water than before. if it suddenly experiences large amounts of rainfall, it may change to release more water, etc.
