The variations that humans have wrought upon domesticated plants and animals are almost infinite.

Every food chain is based ultimately upon plants.

Her eyes seemed fixed upon distant plants, as she unburdened herself.

Food webs are based both on free-floating algae and upon aquatic plants.

Several pests and diseases manifest themselves upon aquatic plants.

They adults spawn from April to June, laying eggs upon aquatic plants when water levels rise due to rainy season.

Its output was mostly functional and based upon plants found in Hawaii.

The Bay checkerspot depends upon plants in two different genera as a larva.

I considered that while shadow seemed lethal to animal life, it had not, in fact, seemed to have any effect upon plants.

Have scientists finished coming upon new plants?