What happens when a substance undergoes a chemical change?

According to the cladogram, which organisms have roundworms as a common ancestor?

'which of these statements about the scientific method is not true? all experiments must follow the same number of steps in the procedure. experiments may be repeated several times. some unexpected results can be beneficial. experimental results may or may not support the hypothesis.

Hemoglobin is a proton that carries oxygen around the body what is hemoglobin made from