gymnosperm造句怎麼寫

He also observed that gymnosperm ovules were not enclosed in an ovary wall, leading to the establishment of one of the basic differences between angiosperms and gymnosperms.

It has also been found that the gymnosperm plants have few copies of CHS gene in a particular nuclear genome, but copy number varies greatly in the angiosperm plants.

Rock plant, based on natural taxonomy system is classified into bryophyte, pteridophyte, gymnosperm, angiosperms;

What recorded them were embryos of angiosperm and gymnosperm.

In Mesozoic, Guangdong flora had a big change, the gymnosperm was prosperous, but it was evolved from the late Paleozoic Cathaysian flora as a whole.