The trait that viruses share with living things is the ability to

a. adapt.
b. use food.
c. respond.
d. reproduce.

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Reproduce is right.

The trait that viruses share with living things is the ability to reproduce. To determine the correct answer, let's analyze each option:

a. Adapt: While viruses can evolve and change over time, they don't possess the ability to adapt like living organisms do. Viruses do not possess the complex mechanisms that allow organisms to adapt to changes in their environment.

b. Use food: Viruses cannot utilize or consume food like living organisms. They do not have digestive systems and cannot generate energy from nutrients.

c. Respond: Viruses cannot actively respond to stimuli or their environment. They lack the sensory and nervous systems necessary for this type of response.

d. Reproduce: Viruses do possess the ability to reproduce, albeit in a unique manner. They can only replicate by infecting host cells and hijacking their cellular machinery, essentially taking control and using it to produce more virus particles.

Therefore, the correct answer is d. reproduce. Viruses can reproduce, but they do so in a parasitic manner by using the cellular machinery of host organisms.