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What are the six characteristics that all living things have in common?
- 1. cellular organization
- 2. contain similar chemicals
- 3. use energy
- 4. grow and develop
- 5. respond to their surroundings
- 6. reproduce
What is a cell?
A cell is the basic unit of structure and function in an organism.
Unicellular, or single-cell organisms, include bacteria... the most numerous organisms on earth.
Multicellular means... composed of many cells.
What five important chemicals make up the cells of all living things?
- 1. water
- 2. carbohydrates (cell's energy source)
- 3. proteins
- 4. lipids (building materials of cells)
- 5. nucleic (the genetic material) - the chemical instructions that direct the cell's activities.
How do living things use energy?
Living things use energy to grow and develop.
What is the difference between 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.
What is a stimulus?
A stimulus is a change in an organism's surroundings that causes the organism to react.
What is a response?
A response is an action or change in behavior.
What does it mean to reproduce?
To reproduce means to produce offspring that are similar to the parents.
What is spontaneous generation?
Spontaneous generation is the mistaken idea that living things arise from non-living sources.
When designing experiments, why should they always be controlled?
In a controlled experiment, a scientist carries out two test that are identical in every way except for one factor.
The one factor that the scientist changes is called the variable. The scientist can conclude that any differences in the results of the two tests must be due to the variable.
What are the four basic needs of living things?
- 1. energy
- 2. water
- 3. living space
- 4. stable internal conditions
Where do all living things get their energy from?
- 1. the sun's energy
- 2. carbon dioxide
- 3. water
- *These three things combine in the organism to make their own food.
What is an autotroph?
An autotroph is an organism that makes its own food.
What is a heterotroph?
A heterotroph is an organism that cannot make their own food.
Why do all living things need water to survive?
Organisms need water to do such things as obtain chemicals from their surroundings, break down food, grow, move substances within their bodies, and reproduce.
Why do all living things need living space to survive?
All organisms need a place to live, a place to get food and water, and find shelter.
Why do some living things have to compete?
Because there is a limited amount of living space on Earth.
What things do they compete for?
- 1. living space
- 2. water
- 3. minerals
What is homeostasis?
Homeostasis is the maintenance of stable internal conditions despite changes in the surroundings.
Ex: Your body's regulation of temperature.