Evolutionary Theory

Question 1

What is the evolutionary theory?

Answer 1

Suggests that we have periods of sleep when we do not need to engage in activities important for our survival

Question 2

Give two pieces of evidence for this theory

Answer 2

• Animals that have few physical needs sleep longer than those who have greater physical needs
• animals don’t move whilst sleeping, thus less chance of being spotted by predators

Question 3

Give two criticisms for this theory

Answer 3

• small animals should remain awake to protect themselves from attack
• some smaller animals (possums) sleep for longer