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The process in which humans choose desirable plant traits and then use the seeds from these plants for planting is an example of

How many chemical elements are known to be essential for normal plant growth and development?

A cover crop of legumes will help to reduce organic nitrogen levels in  the soil.

The gamete cells generated in meiosis 

Depletion of phosphorus from soil occurs primarily by crop removal and soil erosion.

Farmers in Ohio were spraying their crops wearing protective masks.

Plants infected with ectomycorrhiza mycorrhizae will have more root hairs than plants that are not infected.

In plants, hormones 

Which statement is not correct regarding bird-pollinated flowers?

The site of the Krebs/Citric Acid cycle.