Needs of Living Things

Characteristics of Living Things Cellular Organization Uses energy Contain Similar Chemicals Respond to surroundings Reproduce Grow and Develop

Cellular Organization All living things are composed of cells Unicellular – single-celled organisms (ex. Bacteria)

Cellular Organization Multicellular – organisms that are composed of more than one cell (ex. Humans)

Chemicals of Life All living things contain similar chemicals The most abundant chemical in cells is water

Use Energy All living things use energy to do the things that living things must do (ex. Grow and repair injured parts)

Growth and Development Growth is the process of becoming larger Development is the process of change that occurs during an organism’s life to produce a more complex organism

Response A Response is when a living thing reacts to stimuli Stimuli is a change in your surroundings

Response All living things respond to stimuli Living things respond in different ways The ways in which living things respond is called behavior

Response Migration to warm places in a response Hibernation (sleeping) through the winter months is another example

Reproduction Reproduction is the process by which living things produce new organisms (offspring) like themselves.

Spontaneous Generation Spontaneous Generation is the idea that living things come from nonliving things. Francesco Redi disproved this theory.

What Do Living Things Need? Water Energy Living Space Stable Internal Conditions

Water Plants & animals cannot survive without water

Water Water is used to transport stuff through living things Water is necessary to carry out chemical changes in living things

Energy All energy comes from the sun Autotrophs (organisms that make their own food) get their energy directly from the sun

Energy Heterotrophs (organisms that cannot make their own food) get their energy indirectly from the sun

Living Space Living space includes air, water, sunlight, food, and shelter Organisms need living space to survive Organisms compete for living space

Stable Internal Conditions Proper temperature is necessary for living things to carry out life processes Many living things would die without homeostasis

Stable Internal Conditions Homeostasis is the ability of a living thing to keep conditions inside its body constant

Stable Internal Conditions Homeostasis keeps life processes working even if external temperature changes

What are Life Processes? Life processes are the things an organism must do to stay alive Living things carry out all life processes

Life Processes Ingestion Digestion Respiration Excretion

Life Processes Ingestion Digestion taking in food breaking food down so it can be used

Life Processes Respiration Excretion using oxygen to get energy from food Excretion getting rid of waste