If calculate levels within a man’s blood drop to low it can result in twitching depressing, or even death which characteristic of life is the man being affected by

The man being affected by  is that living things require energy.

Living things must maintain homeostasis.

mammal

explanation:

unicellular organisms, like bacteria, are able to perform all life functions within one single cell. multicellular organisms need many different types of cells to carry out the same life processes. each of these special types of cells has a different structure that it perform a specific function.