Which statement best explains how new dog breeds come into existence?
Select one:
1.Wolf genes are introduced into dog cells.
2.Cells from certain dogs are cloned in a laboratory and then fused.
3.Humans develop mating programs that select for certain traits.
4.Dogs with the preferred traits are cloned.

Hydrilla (hydrilla verticillata) is an invasive aquatic plant and one of the most serious aquatic pests in florida. hydrilla has already been introduced to hundreds of bodies of water throughout florida, hydrilla is difficult to control because it grows rapidly and survives in many different water depths and conditions. hydrilla • describe how hydrilla affects native plant and animal species. include both a biotic and an abiotic limiting factor. • suggest one biotic and one abiotic recommendation that could slow the spread of hydrilla