Which of the following remains relatively constant in an ecosystem?

Amino acids contain the elements carbon, hydrogen, oxygen, nitrogen, and sometimes sulfur. of the 20 amino acids found in humans, 11 are called "nonessential" because they can be manufactured by the body when needed. which elements in these 11 amino acids are commonly obtained from the metabolism of sugar molecules?

18. which statement about cancer is true?

Draw a simple labelled diagram if a collenchyma tissue