Final answer:
Students with multiple disabilities often face complex and significant challenges in multiple areas of development. These challenges can affect cognition, communication, mobility, self-care, and social-emotional development.
Step-by-step explanation:
The two common characteristics found in the definitions of students with multiple disabilities are complex and significant challenges in two or more areas of development. When a student has multiple disabilities, they typically have difficulty in areas such as cognition, communication, mobility, self-care, and social-emotional development. These challenges may vary from student to student but are generally present in the definitions of students with multiple disabilities.