Which of the following is most likely to be an observation made by an anatomist?

Question 2 options:

1)

Blood is made up of cells suspended in a fluid extracellular matrix.

2)

Cartilage provides support and protection for developing bones.

3)

The heart has a protective outer covering that produces serous fluid.

4)

Specialized cells in the epidermis produce the dark pigment known as melanin.