Answer:d
Explanation: it has to be
The endocrine system is composed of glands that engender and secrete hormones, chemical substances engendered in the body that regulate the activity of cells or organs. These hormones regulate the body's magnification, metabolism (the physical and chemical processes of the body), and sexual development and function.
Answer:
The important structure the producer posses is "chloroplast".
Explanation:
Chloroplasts work to alter light energy of the Sun into sugars that can be utilized by cells. The complete procedure is named as photosynthesis and it all depends on the slight green chlorophyll particles in chloroplast respectively. Plants are the foundation of all life on Earth. They are classified as the producers of the world. Photosynthesis is the procedure by which plants, some bacteria and some protistans use the energy from sunlight to harvest glucose from carbon dioxide and water. This glucose can be transformed into pyruvate which issues adenosine triphosphate (ATP) by cellular respiration. Oxygen is also designed.