draw a simple random sample of two groups of animals from the four groups, and construct a sample of 20 animals by including all the animals in the samples groups. What kind of sample is this? Show your work

Mammals Birds 1. Aardvark 6. Lion 11. Flamingo 16. Hawk 2. Buffalo 7. Zebra 12. Swan 17. Owl 3. Elephant 8. Pig 13. Sparrow 18. Chicken 4. Squirrel 9. Dog 14. Parrot 19. Duck 5. Rabbit 10. Horse 15. Pelican 20. Turkey Reptiles Fish 21. Gecko 26. Python 31. Catfish 36. Shark 22. Iguana 27. Turtle 32. Tuna 37. Trout 23. Chameleon 28. Tortoise 33. Cod 38. Perch 24. Rattlesnake 29. Alligator 34. Salmon 39. Guppy 25. Boa constrictor 30. Crocodile 35. Goldfish 40. Minnow