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I am guessing that all those brain-like furrows act to increase the surface area of the globe. That may help in keeping the temperature inside cool and to speed up drying when wet.
Enough to give anyone the heebie jeebies... haha
"Somehow, after generations and generations of intimate contact between parasite and host, Rafflesia has ended up with more than the usual parasitic spoils. As a new study published today in BMC Genomics reveals, the parasite expresses dozens of genes that it has co-opted from its host. "