What effect do keystone species have on an ecosystem answers?

The Keystone Species is a species that has a large effect on the environment when it comes to its abundance. In an ecological community, these species are needed for they are the ones which are described as the ones playing the critical role of maintaining the structure of the ecosystem. They are the predators, mutualists and engineers in the ecosystem. Without the keystone species, the ecosystem will not function well and may result to dramatic changes and may cease to exist altogether. 

The main role of dna in the  cell is the long-term storage of information. it is often compared to a blueprint, since it contains the instructions to construct other components of the  cell, such as  proteins  and rna molecules.the main function of rna is to carry information of amino acid sequence from the genes to where  proteins  are assembled on  ribosomes  in the  cytoplasm. mark brainliest, my work is good.