There is no difference between a male female gumamela. Both have male and female parts, just like many other flowers.
No. They lack a nervous system
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I came across this answer as shown "600" - this was put here who by someone who knows nothing about biology, botany zoology or any of the sciences - can I suggest that you do further research and do not rely on one word answers such as this
About 1.5 million known (discovered, named) species. Estimate of total number, known and unknown, varies between 2 and 10 million.