Read this summary of a scientific theory: Cells are the most basic structural and functional units of life. All living organisms are made up of one or more cells. All cells that are alive in the world today came from pre-existing cells.

Which of the following would require this theory to be modified?

A.
The DNA of unicellular and multi-cellular organisms is shown to have many fundamental similarities.
B.
A survey finds that a majority of people believe viruses carry out the basic processes of life.
C.
A prominent scientist says she feels strongly that one day the theory will be challenged by life on other planets.
D.
Scientific observations show that microscopic organisms living in the deep ocean are not made up of cells.

statement #3: proof- ang is congruent to ang ecd : angles are congruent.  

step-by-step explanation:

1: the missing angles in statement #3  

a.) acb  

reason- the reason why the answer is acb is because angle ecd and angle acb are both the same size *that's what the word congruent means this is really simple.  

2: the missing word in reason #3  

c.) vertical  

reason- the reason why the answer is vertical is because the angles in that diagram on figure 2 is slanted, which is vertical, and the e and a both lay on vertical lines. along with the other's, but e and a are the 2 main points you want to focus on. and c is kind of like your starting point, because c is for both angles, not just one.  

i hope that was and understanding.