<span>Each genus contains one or more species. There are 8 main taxonomic groups in biological classification. These are, from the most inclusive to the least inclusive: domain, kingdom, phylum, class, order, family, genus and species. Therefore, each genus contains one or more species.</span>
        
             
        
        
        
Answer:
Interspecific competition
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Answer:
In the mentioned case, both the cells will start to perform replication of their DNA. In the case of G0, that is, the stationary phase, the mammalian cell can pass the restriction point with the supplementation of extracellular proliferation signal. While in the case of G1, which actually does not require any kind of external proliferation signal, as once the cell is in G1 phase, it is ready to go get the next phase. However, both the mammalian cells will cease or halt at G2 checkpoint. 
 
        
             
        
        
        
All plant and animal groups existing together and the physical factors with which they interact compose an ecosystem<span>.</span>
        
                    
             
        
        
        
Answer: The open ocean zone lies beyond the continental slope and contains 65% of the water in the oceans. This zone is divided further into three subzones. The sunlit zone is where photosynthesis takes place. Plankton and jellyfish are drifters that inhabit this zone.
Explanation: