Which of the following statements is false? a) dried bloodstains may tentatively be identified as blood by a peroxidase test. b) all bloods contain the enzyme peroxidase. c) a-b-o antigens are present in all human blood. d) the kastle-meyer test is used to determine whether blood is of human origin.

The correct answer is option D.

Explanation:

The Kastle-Meyer test is a presumptive test of the blood. A presumptive test is a test that is used to identify, confirm or presence of the substance like in this test the possible presence of the haemoglobin is detected.

In this test the chemical known as the phenolphthalein which is a chemical indicator that confirms the presence of the haemoglobin by producing pink color to the solution of the sample.

Thus, the correct answer is option D.

lizards have adapted to life in the desert. some desert lizards have toes with spiny scales to them run across the sand without sinking. some use the sand to hide from predators, or to search for small animals that they prey upon.

i thinking chemical change