What does the endocrine system consist of

Hypothalamus, pituitary, parathyroids, thyroid, adrenals, pineal body and reproductive organs.

These are the glands that secrete and produce hormones.

producers within ecosystems are essential as they are at the base of the food chain. plants are examples of producers. they use the process of photosynthesis to capture light energy and use it to convert simple inorganic substances (carbon dioxide and water) into organic substances (glucose).