Answer:
True.
Step-by-step explanation:
The Sun have positive and negative effects. A positive effects is that our skin produces vitamin D thanks to sunlight, this vitamin is essential for bones, it enables us to absorb minerals like calcium, this means that the absence of sunlight will caused a decrease in bone volume and density.
On the other hand, a negative effect of the Sun is that can lead to cancer, the excess of ultraviolet rays from the Sun also affects our skin, killing cells, generating cancerous cells.
Basically, these example represent the duality pointed in the statement, the Sun can be positive and negative to us.