Euhadra is a genus of Japanese land snail in which some species have right-handed shell spirals and other species have left-handed shell spirals. Snail with right-hand shells cannot physically mate with left-hand shell snails. Which is the best hypothesis for an isolating barrier between right- and left-handed Euhadra species?

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the liver is an organ endowed with a fantastic ability to regenerate

. thus, if a hepatectomy (ablation) of 70% of the hepatic mass is performed in the rat, there is complete recovery in 7 to 10 days.

prokaryotes are beings that have existed since the existence of life on earth, and do not come from another realm.

ribosomes are organelles that exist naturally in eukaryotes, either in free form or attached to the endoplasmic reticulum.

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