What is life? (p.23-26)

The organism is a living thing.

The caracteristics of living things.

All living things have a cellular organization, contain similar chemicals, use energy, respond to their surroundingds, grow and develop and reproduce.

Cellular organization: All organisms are made of small building blocks called cell. A cell is the basic unit of structure and function in an organism.

Organisms may be composed of only one cell or of many cells. Unicellular or single-called organisms, include bacteria. Multicellular organisms are composed of many cells that are specialized to do certain tasks.

All living things are composed of chemicals, water, carbohydrates, proteins and lipids, nucleic acids or genetic material.

Energy use: the cells of organisms use energy to do what living things must do, such as reparing injured parts.

Response to surrounding: is the act that causes the organism to react to surroundings, that causes the organism to react is called a stimulus. Stimuli include changes in temperature, light, sound and other factors. An organism reacts to a stimulus with a response, an action or change in behavior.

Growth and development: grownth is the process of change thet occurs during an organism´s life to produce a more comlex organism.

Reproduction: is the ability to reproduce or produce offspring .

Activity: look at one of your eyes in a mirror, cover one eye with your hand for a minute. While looking in the mirror, remove your hand. Observe how the size of your pupil changes. Draw and describe in your notebook the reaction.