Answer:
During Darwin's journey on the HMS Beagle, most of his observations were made on the Galapagos Island. Some of his observations were:
1) The Plants and animals differed from island to island.
2) The tortoise on one island had saddle-shaped shells while on the other island had dome-shaped shells.
3) He observed the different finches of the Galapagos island.
4) He discovered 13 different types of finches present on the Galapagos island.
5) He observed that each that each type of the finch differed in the beak type.
6) He observed that the beak shape changed for finches because of the different food varieties present for them in each area.
7) He observed that traits can be passed from a parent to an offspring.
8) He observed natural selection.