There are 4 thing that need to happen for natural selection to occur:
1) reproduction
2)heredity
3)variation in fitness or organisms
4)variation in individual characters of the population.
Answer;
No, the petal is not alive according to the characteristics of life
Explanation;
-This is because the flower petal on it's own can not Grow, or Reproduce, Adapt to it's Environment, Use Energy, or Respond to it's Environment.
-Growth, reproduction, response, and respiration are some of the characteristics of living organisms, therefore for anything to be considered living it must possess these characteristics.
Answer: Animals
Explanation: Animal cells are eukaryotic but so are plants. However, only an animal can fly to get its food. Plants get their food by the sun or by themselves.
Hope that helped! :)