Characteristics of Life Unity within Diversity

What do Biologists do? Study the diversity of life Research diseases

What do Biologists do? 3. Develop technologies 4. Improve agriculture

What do Biologists do? 5. Preserve the environment

Response vs. Stimulus Stimulus: Anything that is part of either environment (internal or external) and causes some sort of reaction by organism. Response: reaction to a stimulus

Response vs. Stimulus Examples The plant bends toward the light. An animal is cold so it moves into the sun. Getting a drink when you are thirsty. A snake lunges at a rabbit.

Living!

Non-living!

Characteristics of Life They can be remembered by the mnemonic: Hog Racer

Characteristics of Life H: Homeostasis O: Organization G: Growth and Development R: Reproduction A: Adaptations C: Cells E: Energy R: Respond to Stimuli

Homeostasis Maintaining relatively stable internal conditions despite external surroundings Examples: Regulating Body Temperatures Controlling glucose levels in body

Organization Living things are organized

Growth and Development Types of growth: Cell division increasing the number of cells Example: Skin Cells Cell enlargement increasing the size of a cell Example: Muscle Cells

Reproduction Production of Offspring Sexual: Involves egg and sperm Asexual: Cloning, budding, self fertilization

Adaptations Ability to survive in one’s environment

Cells Basic building blocks of life Unicellular: One cell Multicellular: More than one cell

Energy Living organisms use energy Autotrophs make their own food Heterotrophs : depend upon autotrophs for energy

Respond to Stimuli Stimulus creates a response

Learning Checkpoint R A C E H O G

Misconceptions Senses (see, hear, taste, touch, smell) Uses oxygen Produces carbon dioxide Movement These are NOT necessary in order to be considered alive.