1. Chapter 1 Lesson 1

2.  All living things are organized.  They grow and develop.  They reproduce.  They respond.  They maintain certain internal conditions.  They use energy.  Organisms

3.  What is the smallest unit of life?  Cell  Unicellular  Only one cell  Specialized structures  Multicellular  Two or more cells  Different cells perform different functions

4.  Growth  Unicellular Increase in size  Multicellular Increase in number of cells  Development  Changes that occur during lifetime Specialization of cells  Explain the development of a frog

5.  Unicellular  Asexual reproduction – cell division  Multicellular  Sexual reproduction

6.  Internal stimuli  Hunger, thirst, fatigue  External stimuli  Light, temperature, sights, sounds  How can an external stimulus create an internal stimulus?

7.  Ability to maintain internal conditions when outside conditions change  Fever, shivering, sweating, collecting excess water  Why is maintaining homeostasis important to organisms?  Homeostasis ensures that an organism can function.  Why do you think the human body cannot maintain homeostasis for very long in water that is less than 10 degrees C?

8.  Everything an organism does requires energy.  What is the source of energy for almost all life on Earth?  Almost all life on Earth gets energy from the Sun.  From which food sources does the badger in Figure 6 get energy?  The badger gets energy from the snake, lizard, and squirrel.

9.  What do the arrows leading to the pronghorn from the desert paintbrush and from the pronghorn to the mountain lion mean?  The arrows mean that the pronghorn gets energy feeding on the desert paintbrush, and the mountain lion gets energy by eating the pronghorn.  Why is there no arrow leading away from the mountain lion?  There is no arrow leading away from the mountain lion because the mountain lion is a top predator and is at the top of this food chain.