If there is no Sun Light the Core of the earth would cool, all living organisms would be killed and when the sore of the earth cooled the earth would implode due to a sub-normal reaction between heat and gravity, the gravity would win and implode the earths crust. This would cause a huge super-nova in our galaxy and send earth particles flying through the universe.
they would die!
Sunlight is very useful to people, plants, and animals. Without sunlight the world would become too cold, it warms the earth. It helps plants to grow, this provides food for people, and animals.
They will die.
people will not live
animal cells do no contain the chloroplasts that collect the sunlight in a plant cell to transfer glucose into ATP.
Sunlight can cause sunburn - at least in some animals. Vulnerability varies by species.
Animals that avoid the sunlight do not want to be seen by predators.
In animals and people, food and water. In plants, sunlight, water and minerals in the soil
People are "animals". Animals can not make their own food they have to eat other animals and or plants to survive. Plants can make their own food (from air, water and sunlight) - they are the basis of all food - without plants there could be no animals.
because if they had no sunlight they wouldn't have the energy they need to use respiration in cells
Yes they do
Nothing. Only animals are occasionally treated with small doses for fleas which is not enough to harm them. People the same thing if they are treating lice or something similar.