Monotremes are egg laying mammals (Prototheria) instead of mammals which give birth to live young like marsupials (Metatheria) and placental mammals (Eutheria). They are still classified as mammals because they feed their young on mothers' milk. Australia has two species of monotremes: the platypus and the short-beaked echidna.
What cs carries substances around the body? The circulatory system is they system in the body that transports  material throughout the body. It carries nutrients, water, and  oxygen to all the cells and carries waste â¦material away from the  cells. Making the world better, one answer at a time. the substances that blood carry as it goes around in the body are the vitamins, nutrients, hormones, chemical substances, oxygen and CO2 or carbon doixide.
A typical person has around 4-5 litres of blood. The blood is the transport system by which oxygen and nutrients reach the body's cells, and waste materials are carried away. In addition, blood carries substances called hormones, which control body processes, and antibodies to fight invading germs.n the outside there is a layer of fat, and across its surface are a network of veins and arteries, known as the coronary vessels, which keep the muscle supplied with blood. The heart's job is to pump blood around the body to where it is needed.