Develop from a single fertilized egg and have identical genes.
Answer:
the sperm fertilizing the egg
Explanation:
By the late 1830s, botanist Matthias Schleiden and zoologist Theodor Schwann were studying tissues and proposed the unified cell theory. The unified cell theory states that: all living things are composed of one or more cells; the cell is the basic unit of life; and new cells arise from existing cells.
Answer:
I believe that this is balanced.