The right answer is have a frank, open discussion with him about his feelings.
The combination of a depressive disorder with a serious physical illness such as cancer can make the identification and treatment of depression more difficult. Indeed, the symptoms of depression may be underestimated and attributed to the other disease.
D) The island will suffer a loss of native plant and animal species. Due to loss of plants the animals living in a particular area might not be able to find food to survive causing them to die eventually because of starvation