Because we are heterotrophs and plants are autotrophs.
We cannot make our own food. We make food using vegetables,meat, etc.etc.

Why we cannot make our own food like plants do?

1. Lack of Chlorophyll:
Humans and other animals lack the pigment chlorophyll, which is essential for photosynthesis. Chlorophyll absorbs sunlight and converts it into chemical energy, which plants use to produce their own food.

2. Complex cellular structure:
Plants have specialized cell structures called chloroplasts where photosynthesis takes place. These structures are not present in animals, making it impossible for us to carry out photosynthesis.

3. Nutritional requirements:
Humans and animals have different nutritional requirements compared to plants. We need a variety of nutrients such as proteins, fats, and vitamins that cannot be synthesized through photosynthesis alone.

4. Mobility:
Plants are stationary organisms, rooted to the ground, which allows them to absorb water and nutrients from the soil. Animals, on the other hand, have evolved the ability to move and hunt for food.

5. Evolutionary adaptation:
Over millions of years, plants have evolved the ability to produce their own food through photosynthesis. Animals have evolved to consume plants or other animals to meet their energy needs.
In conclusion, the lack of chlorophyll, complex cellular structure, different nutritional requirements, mobility, and evolutionary adaptation are some of the reasons why humans and animals cannot make their own food like plants do.