How do all multicellular organisms begin?

a.
as complex organisms

b.
as a single cell

c.
by expanding the size of their cells

d.
by creating all their cells at one time

1. law of superposition: when there are horizontal layers of rock. the layers at the top are the youngest.

2. law of uncomformity: where one layer is much younger than the previous one, therefore creating a gap in the time record.

3. inclusion: when there is a solid stone inside of another.

4. intrusion: a feature formed when a stone is filled with magma.

hope i answered your question.

i believe your answer would be phagocytosis