Final answer:
The prefix meaning 'half' is 'hemi-', as in hemisphere, which refers to one half of the cerebral hemispheres. So, the correct answer is (d) hemi.
Step-by-step explanation:
The prefix that means half is 'hemi-'. This prefix is used in various contexts to indicate that something is halved or split into two equal parts. For example, in biology, a hemisphere of the brain refers to one half of the cerebral hemispheres. In response to the multiple-choice question, the correct option is (d) hemi. This can be compared to other prefixes such as 'bi-', which indicates two, as in biceps, meaning two origins, or 'quadri-', indicating four, as in quadriceps, meaning four muscles in a group.