Answer:
Selective breeding.
Explanation:
Selective breeding method is used in order to produce more bushes that have the same kind of berries. In this method, Saskatoon bush which is a wild bush can be crossed with another bush belongs to the same family so the new seeds produced having the characteristics of Saskatoon bush and is able to produce large and sweet berries just like berries of Saskatoon bush.
The nitrogen cycle provides nitrogen to the ecosystem from the atmosphere, ground and oceans. Nitrogen is an important component of complex molecules such as amino acids and nucleotides, which lead to the creation of proteins and DNA, the building blocks of all life .
Gravity is the force that pulls objects toward Earth's center.
