What is the correct way to write sentences 23 and 24?
F Many of the species that once made their home on Madagascar are now extinct, scientists, however, are still making discoveries.
G Although many of the species that once made their home on Madagascar are now extinct and scientists are still making discoveries.
H Many of the species that once made their home on Madagascar are now extinct, but there are scientists. Who are still making discoveries.
J Although many of the species that once made their home on Madagascar are now extinct, scientists are still making discoveries.