Characteristics of Life

Which of the following characterisitics of living things best explains why your legs and arms get longer and stronger as you get older?

• Living things repsond to their environment.
• Living things maintain internal balance.
• Living things are made up of units called cells. 
• Living things grow and develop.

Both a fast-moving stream and a dog respond to the environment and grow and develop, but this characterisitic of life is why a dog is considered alive and a stream isn't. 

• The ability to move.
• Th ability to grow and develop.
• Being made of cells.
• The ability to change over time. 

Before a big soccer game Charlie always eats a big dinner. Which characteristic of life does this fact best describe?

• Living things respond to their environment.
• Lving things reproduce.
• Living things grow and develop.
• Living things use energy.

Which of the following characteristics of living things best explains why birds fly south for the winter?

• Living things respond to the environment.
• Living things maintian internal balance.
• Living things are made up of units called cells. 
• Living things are based on a universal code.