The physical characteristics of an organism is its phenotype. I remember this because phenotype and physical both start with 'ph.'
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Answer:
Cyanobacteria are responsible for first adding oxygen to the Earth's atmosphere.
It is true that telomerase activity declines with old age which explains why cells lose their ability to divide after many replications.
Telomeres are DNA–protein complexes found at the ends of each chromosome they contain repetitive sequences of DNA. Telomeres protect the genome from nucleic bases degradation, unnecessary recombination, repair, and prevent the fusion of chromosomes. Telomeres, therefore, play a vital role in preserving the information in our genome.
Telomeres shorten with every consecutive DNA replication cycle limiting the number of cell divisions a cell can undergo, Telomeres act as a tumor suppressor by halting the replication of cells which contains several mutations after many division cycles.
To learn more about tumor suppressors here
brainly.com/question/16188646
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