What is the original source of all energy for animals?

Question

The sun
other animals
plants
sugars

Answer 1

The original source of all energy for animals is the sun. Through the process of photosynthesis, plants convert solar energy into chemical energy in the form of glucose. Animals then obtain energy by consuming plants or other animals that have eaten plants. So, while animals rely on plants (or other animals) for energy, the ultimate source is the sun.