Darwin's Three Conditions for Evolutionary Change:

Question 1

Variation:

Answer 1

Random variation in the population gives an advantage to the animal.

Question 2

Competition:

Answer 2

The long neck allows giraffes to compete for food, essential for reproduction.

Question 3

Inheritance:

Answer 3

Successful random variation is naturally selected & passed on to the next generation, leading to the extinction of giraffes without longs necks.