One is immune system.
Answer: They are part of the scientific method. The test results confirm or disprove the hypothesis.
Explanation:
Amniotic Egg - This type of egg does not require water. Organisms could lay their eggs on land they would not dehydrate.
Lungs - got to be able to extract oxygen from their environment for cellular respiration.<span />
Trace metals, like iron and magnesium, are considered _Building blocks of molecule__________________, while organic compounds, like vitamins, are considered________Complex Molecule___________
