Google Maps, Google Earth, Youtube, Google Ads, all started from aquisitions, to name the big services. They have many more small services and features coming from aquisitions.
Google ads - where they did advertising on their own site was homegrown. DoubleClick helped them expand to other sites. None of their hardware acquisitions have been successful. Android hadn’t developed a piece of hardware when it was acquired AFAIK.
See https://en.wikipedia.org/wiki/List_of_mergers_and_acquisitio... for a good chronologic list.