Page 87 - Science Course 1 (Book 1)

Mo3-L4a: What are Unicellular and Multicellular Organisms?

Let’s Begin Humans, like most
other animals,
have four main
Multicellular Organisms types of tissue:
- muscle
All cells in a multicellular organism come from one - connective,
cell: a fertilized egg. - nervous,
and epithelial. Muscle Tissue Epithelial Tissue
The process by which cells become different types of
cells is called cell differentiation.

Nervous Tissue Connective Tissue

The three main types of plant tissue are dermal,
vascular, and ground tissue.

Stem cells are unspecialized animal cells that are
able to develop into many different cell types.

Plants have
unspecialized cells
similar to animal
stem cells.
Organs are groups of different tissues working
These cells are together to perform a particular job.
grouped in areas of
a plant called Organ systems are groups of different organs that
meristems work together to complete a series of tasks.

Tissues are groups of similar types of cells in
multicellular organisms that work together to carry
out specific tasks

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