Two trophic levels
Typically there are three or four trophic levels in a community because after this point, it becomes very hard to sustain organisms. The amount of energy lost at each trophic level makes it harder and harder to sustain life.
Here is the answer. The <span>epithelial tissues that secrete hormones and other substances used in metabolism are the glands. These glands belong to the endocrine system. Hope this answers your question. Have a great day ahead!</span>
This is gravity.
Gravity is a force that is exerted on all objects on earth. The greater the mass, the greater the force of gravity is on an object.
