We call this a life cycle. The world is full of different plants like flowers, trees and vegetables but most plants grow from a seed or a bulb. There are a series of steps that need to happen for ...

The nitrogen cycle steps are kind of like a currency ... Ammonia in the soil can be used directly by plants, but it's also ...

Two major steps ... land plants prosper, forming the basis for modern land-based ecosystems and fundamentally altering the course of evolution of life on earth, said Qiu. The first step was ...