Answer: Working for the Bendix Aviation Corporation, American John Chamberlain invented a multifunctional machine which could wash, rinse and spin in a single cycle. A patent was filed the same year for this model, which is considered the first automatic washing machine. 1940
Explanation:
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The diversity of birds helps them survive by the differences in their beaks the different shapes and sizes means they all eat different food therefore that is not an issue. Different coloration is not an issue due to the species separating from each other. The diversity keeps the birds alive by signifying differences.
Hope this helps!
I believe it was there religion or they didn't like change and thought strength was best for everything.