Your question is rather unclear but from what I can tell either there were not an even amount of Petri dishes or some of them were left open while others were not.
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Answer:
D
Explanation:
people take it into account that the environment is fine for growing children hence giving birth
Nanotechnology offers the means to target chemotherapies directly and selectively to cancerous cells and neoplasms, guide in surgical resection of tumors, and enhance the therapeutic efficacy of radiation-based and other current treatment modalities.
When continents broke apart from Pangaea lots of different species got separated to different parts of the world. The animals and other living things had to have learned how to adapt to the different climates or they would die and go extinct.
