The statement 'if an individual failed to develop any mature lymphocytes, they would have lessened innate responses to infection and lessened adaptive responses to infection' is true.
In the field of biology, lymphocytes can be described as a certain kind of white blood cells that help the body in generating an immune response in various ways. they also help in activating other immune cells such as the B cells, natural killer cells, T cells etc.
Lymphocytes help in generating an innate as well as an adaptive response. Hence, if an individual fails to develop any mature lymphocytes, then the innate, as well as the adaptive responses against infections, will be affected.
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