The angiosperms are the sister phylum to which gymnosperm phylum?

The flowering plants, also known as angiosperms, are similar to gymnosperms which are capable of producing seeds. However they are distinguished from the latter by characteristics which includes flowers, endosperms within the seeds and the production of fruits that contain the seeds. They are the sister phylum to the following four gymnosperm groups namely, the conifers, cycad, gingko and gnetophytes.

The dinosaurs went extinct 65 million years ago. The Mesozoic Era lasted about 180 million years, and is divided into three periods, the Triassic, the Jurassic, and the Cretaceous. Each of these periods is divided into many epochs and ages. Mesozoic means "Middle Animal" and is sometimes called the age of reptiles.

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