1. Vital functions
All living beings perform three vital functions:

Nutrition

Interaction

Reproduction

2. Vital functions

Nutrition:
It is a combination of processes by which living
beings exchange matter and anergy with
their environment.
There are two types of nutrition:

Autotrophic: living beings which make their own
organic matter from inorganic matter using a source
of energy.

Heterotrophic: living beings which feed on organic
matter produced by other living being.

3. Vital functions

Interaction:
All living beings interact with their environment
and with other living beings to survive.
Interaction enables living beings to receive
and respond to a stimulus.

4. Vital functions

Reproduction:
It is the biological process by which new
individual organisms are produced.
There are two types of reproduction:

Asexual: it requires only one parent which produces
new, genetically identical living beings.

Sexual: it requires two parents: a male and a
female, which provide a gamete or sexual cell.
These two cells join to form a new living being,
different both individuals.