Arteries take blood from the heart. the walls of an artery are made up of thick walls and elastic fibres. veins carry blood the heart and also have valves. the link arteries and veins, and have a one cell thick wall. blood is made up of four main things the liquid part of the blood; red blood cells to carry ; white blood cells to protect the body from disease and to blood clot.

Arteries take blood away from the heart. The walls of an artery are made up of thick muscular walls and elastic fibres. Veins carry blood to the heart and have valves. The capillaries link arteries and veins. Blood is made up of 4 things: plasma red blood cells to carry oxygen, and platelets to help blood clot.

a, i am pretty sure.

many phylogenetic trees have a single lineage at the base representing a common ancestor. a lineage that evolved early from the root and remains unbranched is called basal taxon. when two lineages stem from the same branch point, they are called sister taxa.

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explanation: