Respuesta :
1. The four level of organization from simplest to complex are- a. Cell level - All cells have some common function but individual cells vary widely in shape and size,reflecting their unique function in body. eg: smooth muscle cells. b.Tissue level- Tissues are group of similar cells that have common function . Eg- smooth muscle tissue. c.Organ level- An organ is a discrete structure compose of at least two tissues type that performs a specific function for the body. eg - blood vessels. d. Organ system level- when organs work together to accomplish a cool on purpose. eg- cardiovascular system. 2. Homeostasis is the state of steady internal conditions maintained by living beings.3.The respiratory system help maintain homeostasis by the respiratory system bringing the right level of oxygen while removing carbon dioxide.The skeleton system helps maintain homeostasis by keeping them in proper function and place and interacts with muscles.4. The circulatory system carries hormones from the endocrine system and immune system's WBC that fight of infection. working together,these systems maintains internal stability and balance,otherwise known as homeostasis.