Think of coevolution as an arms race. The rabbit population develops faster running ability and the fox population must have variant individuals that can keep up and these individuals are the ones who will be reproductively successful and leave these traits to the next generation of foxes and the alleles in the fox population change in frequency. Meanwhile the slower rabbits are eliminated from the population and the faster rabbits are reproductively successful, and so on.
Only the limitations of physics and the realities of variant organisms keep this arms race within the confines of the physical and biological world.
Organisms in the same family
organisms in the same order (APEX)
Because it helps the grass and little organisms in it survive.
Unicellular would imply organisms that thrive as an individual as one cell, like bacterium (E. coli., amoeba). Multicellular would imply organisms that only live successfully as a whole group of cells (humans, fish).
there will be no more penicillin for cure foot they break down dead organisms
How about revolve, devolve, evolve? Or, if you are a fan of cowboy movies, a revolver?
Earth would be filled with dead organisms.
These organisms would be called mutants.
Organisms in the same family
Organisms in the same scientific order would have the most similar traits.
Archaebacteria
organisms in the same order (APEX)
The organism would die
Organisms that can interbreed are found at the species level.
lichens
The organisms that eat cordgrass will die, then the other organisms, who eat the cordgrass eating organisms, will die of hungry.
Grasshopper