1.3 Studying Life Biology = the study of life Bios = life | ology = study of

8 Characteristics 1. The cell - the smallest unit of life Unicellular = 1 celled Multicellular =many celled

2. Reproduction Sexual = DNA from 2 different parents Asexual = single parent (cloning, budding)

3. Genetic Code – directions for inheritance (DNA)

4. Growth and Development Growth = getting larger Development = changing shape and structure Differentiation = cells look different and perform different functions

5. Use Energy Metabolism = chemical reactions in the body Animals eat to obtain energy Plants photosynthesize

6. Response to environment Stimulus = a signal Response = a reaction

7. Internal Balance Homeostasis – maintaining constant internal conditions (sameness) 8. Evolution - species change over time

Branches of Biology Zoology = animals Paleontology = ancient life Cytology = cells Botany = plants Entomology = insects You guess… Microbiology = Ecology = Anthropology =

Levels of Organization Molecule Cell Tissue Organ Organ Systems Organisms Population Community Ecosystem Biosphere

CHECK FOR UNDERSTANDING 1. There are _________ characteristics of life 2. The smallest unit of life is the ___________ 3. All living things must be able to ____________________, or to make more of their own kind. 4. All living things have a _____________________, which are like instructions for building the body 5. During development, some cells become liver cells, some become skin cells and some become muscle cells. This process is called ________________________ 6. Animals get their _______________ by consuming food. Plants get it by __________________________________ 7. __________________________ is the maintaining of an internal balance, or sameness 8. ______________________ is the process where species change over time.