You might want to take supplyment to get vitamin C
There are two ways you could get a Vitamin A supplement. The first is to buy a multivitamin. These will have plenty of Vitamin A as well as many other health promoting nutrients. The second way is to simply purchase a Vitamin A supplement.
Vitamin treatment usually is done in three ways
Frogs take in air food and water through their skin
hot
No they are not enhanced by vitamin C.
Different animals show different ways of getting/eating their food.
they depend for food
To increase testosterone the easiest way is to increase exercise. Other ways to improve it is to increase zinc, and vitamin d intake.
You catch food by setting traps to catch them. Other ways are by fishing, harvesting, and hunting for food.
Food can be browned in a few ways, and some are better than others depending on the food. You can fry it, sear it, broil it, and bake it to make a browned color.
Food and Oxygen
It is very useful in far more ways than one. Sunlight is needed for plants to grow and to go through photosynthesis, for us (and other animals) to obtain Vitamin D, to provide light for us to see, and many, many other things.