Answer:
All living organisms respond to stimuli.
All living organisms can reproduce.
The processes that are not taking place which allow for tumors to form is that the cancer cells are not responding to the signals that regulate the growth of cells. Living cells use cell division to reproduce and to repair damages; cell division is tightly controlled by the body system. When cells stop responding to the regulating signals, tumors will be formed.<span />
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Everything in an ecosystem serves to balance it. Predators help by balancing the preys' effect so they don't overpower the ecosystem. (Think of the excess amount of deer due to excess of hunting wolves)
Answer: The correct answer is nucleotide.
Explanation:
Nucleic acids are the polymer of nucleotides which are attached with each other with the help of phospho-diester bonds.
Nucleotide consists of sugar (ribose in RNA and deoxyribose in DNA), phosphate group, and nitrogenous base (A, T, G, and in DNA; and A, U, G, and C in RNA).