Chapter 2-1

Cellular organization – all organisms are made up of cells. Unicellular = 1 cell or multicellular =

many cells Chemicals of life

Living things are made up of chemicals. Ex. Water, carbohydrates, proteins, etc.

Energy use – need energy to do what we need to do

Response to surroundings – react to changes in environment. Stimulus = the change in the

environment Response = reaction to the stimulus

Growth & development Growth = process of becoming larger Development = process of change to

produce a more complex organism Reproduction – produce offspring

similar to parents

Living things come from living things through reproduction

However, 400 years ago people once believed that life could appear from nonliving things (spontaneous generation)

Covered jars – no maggots

Uncovered jars -- maggots appeared

Bacteria grew in the unboiled broth but not in the boiled broth.

When the boiled broth was exposed to air, bacteria grew. Pasteur concluded that bacteria do not spontaneously come from broth.

WaterFoodLiving spaceHomeostasis = maintaining your

internal environment. Example = body temperature (98.6

degrees). When your body temperature goes above that your body responds by sweating to cool you down.