Speciation by Poonam

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Across
  1. 2. the offspring of two plants or animals of different species or varieties, such as a mule.
  2. 3. the condition of being physically fit and healthy.
  3. 5. a community of animals, plants, or humans among whose members interbreeding occurs.
  4. 6. a comfortable or suitable position in life or employment.
  5. 7. relating to time.
Down
  1. 1. process of change by which an organism or species becomes better suited to its environment
  2. 4. the remains or impression of a prehistoric plant or animal embedded in rock and preserved in petrified form