4. Mark the following statements as true or false. If a statement is false, correct it to make a true statement.
a. Erythrocytes are biconcave discs with prominent nuclei.
b. The main function of erythrocytes is to transport oxygen on the protein
hemoglobin.
c. Hemoglobin forms oxyhemoglobin when it binds to oxygen.
d. Hemoglobin consists of two polypeptide chains bound to a heme group.

they had the law tat factories that produces smoke cannot be built near residential buildings.

building of proper sewage system was done to ensure that the waste is carried away from the humans so that they do not get diseases from it.

also they built water systems to provide water in those areas which are drought prone.

the answer is c.

by: nicholas dooley

the answer is z.

the human body has five levels of organization. level 1: cells. cells are the basic units of life and form the first level of organization. cells in the human body have specific functions. examples include nerve cells, blood cells, liver cells, and so on.