Animal Life Cycles

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Across
  1. 4. When a sperm cell and an egg cell combine to form a zygote
  2. 7. The part of an egg that contains food for the developing embryo
  3. 8. The larval form of a butterfly
  4. 10. The type of insect that a mealworm grows into
  5. 12. A recently hatched salmon still attached to the yolk sac
  6. 13. A baby organism developing inside the egg or mother
  7. 15. A series of distinct growth stages that are different from one another
  8. 17. The type of insect that a caterpillar grows into
  9. 18. The stage of salmon reproduction when eggs are laid and fertilized
  10. 19. Form of fertilization that occurs within the mother's body
Down
  1. 1. The only group of mammals that lay eggs
  2. 2. A type of metamorphosis where an insect goes through four very distinct phases
  3. 3. The nonfeeding stage of metamorphosis when an insect develops a hard, case-like coating
  4. 5. Form of fertilization that occurs outside the mother's body
  5. 6. A type of metamorphosis where an organism goes through stages that generally resemble the adult
  6. 9. A fish that lives in the ocean and swims back upstream to reproduce
  7. 11. The immature stage of an insect that hatches from an egg
  8. 14. The specific name for the pupa of a butterfly
  9. 16. The young of living organisms