Final answer:
Living things must have certain characteristics such as homeostasis, reproduction, and complex organization. Movement and photosynthesis are not required for all living organisms, as some may be immobile or non-photosynthetic.
Step-by-step explanation:
Maintaining a stable balance of internal conditions, which is known as homeostasis, is indeed a critical characteristic of living things. Among the options provided, other characteristics that ALL life must have include:
- Reproduction: All living things are capable of reproduction, which is the process that allows living things to give rise to offspring.
- Complex organization: All living things have complex chemistry and are built of cells, which are the basic units of life's structure and function.
While the ability to move and perform photosynthesis can be found in some living organisms, they are not required for an organism to be classified as alive. Instead, characteristics such as order, sensitivity or response to the environment, growth and development, regulation, energy processing, adaptation, and evolution are essential in defining life.