The likely substance to be found in high concentrations in
the blood stream of a vertebrate is water, it is considered to be polar and the
water is made up of blood and this is usually the substance that made up or a
component that a living thing has such as humans.
B) it involves a chemical reaction.
Breathing is a part of physiologicalrespiration and functions to bring oxygen into the lungs and expel carbon dioxide. Cellular respiration is a chemical process by which energy is obtained within individual cells from biomolecules like glucose.
Homo Erectus beings were literally mixed between Ape and Homo Sapien but I could be wrong... Also they Were the cavemen of the Homo Sapiens to I believe. Hope my Opinion/Answer helped. :)
The cell membrane protects the inside of the cell from the outside world.
The cell wall protects the plants inside of the cell from the outside world.