Answer:A weak immune system
Explanation:
When people get older their immune system becomes weak including the function of the T cells which are cells responsible for fighting infections.
This means it becomes hard to recover from a flue when someone get sick and they are always prone to sickness since their immune system no longer has the power to fight infections.
Socially useful part of society.
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Answer:
c.
Explanation:
Based on the information provided within the question it can be said that the best representation of this would be to accept initial offers of favors in good faith, but be ready to react to them as tricks, not favors, if they are later revealed as exploitation devices. This will make you seem grateful but at the same time remain defensive in case they try to exploit the reciprocity rule and want something in return.
Answer: Differentiation
Explanation:
The differentiation is one of the type of normal process that occur due to the selective change and it is distinct from in the function. The differentiation is basically refers to the breaking into the smaller parts.
According to the question, the formation of the different types of cell which cause the genes sometime ON or OFF then this process is basically known as the cell differentiation. This process is mainly occur due to the process of genes expression.
Therefore, Differentiation is the correct answer.
