Unit 1 Cells and Systems

Chapter 1 The cell is the basic unit of life.

1.1 Observing Living Things

In this paragraph, we talked about the importance of the Five Characteristics of Living Things. We also gave examples and a brief discription of each characteristic.
  • Living things respond to their environment
  • Living things need energy
  • Living things grow
  • Living things reproduce
  • Living things must get rid of wastes
Living things respond to their environment, for example, hissing is the cat's stimulus or hunger and thirst are stimuli that cause you to respond by eating or drinking. A stimulus/ stimuli is anything that causes a living thing to respond.
Living things need energy. Us, humans get energy from the food we eat. Plants combine carbon dioxide, water, and sunlight to produce sugar or food.
Living things grow. DID U KNOW that even if you stop growing taller, the cell in your boday will still increase in number, it will continue to replace cells as they wear out and die.
Living things reproduce and replace the older individuals that die, bacteria reproduces every 20 minutes.
Living things must get rid of wastes. Animals produce wastes such as carbon dioxide, urine, feces. For example, when a whale eats food for energy, carbon dioxide is producd. So exhaling might be the best way for the whale to get rid of its body wastes.

1.1 Characteristics of living things Page 10

Even if we didn't have these characteristics, would we die?

If we were to miss even ONE characteristic, would we still die?

If a cheetah could not run fast, would it tun to prey instead of predator?