Whye are only green plants are called producers

They manufacture their own food in the process known as photosynthesis.

Explanation: Green plants have chlorophyll which is a green pigment found in plant leaves. Chlorophyll helps the plants to trap energy from the sun and use it to produce glucose in the presence of carbon dioxide and water. Green plants are called autotrophs or producers because of their ability to produce their own food. The balanced chemical equation for photosynthesis is 6CO2 +6H2O + sunlight ---> C6H12O6 + 6O2.

protein makes up the building blocks of organs, muscles, skin, hormones and pretty much everything that matters in your body.

some choices are:

peanut butter

seeds

eggs

yogurt

meats

fish

so pretty much meat, dairy, nuts, and grains.