An arthropod has all the following characteristics except: a. three embryonic germ layer
b. pseudocoelom
c. bilateral symmetry
d. protosome development
e. true tissues

b. pseudocoelom

Explanation:

A pseudocoelom is a false body cavity of some invertebrates which occupies the space localized between the mesoderm and the endoderm of the gut. This false cavity is found in nematodes.

Arthropods exhibit:

1- Bilateral symmetry because both opposite sides of the body are similar,

2- they are protostomes because the blastopore becomes the mouth during embryonic development,

3- they have true tissues because tissues are formed by groups of cells which share a common function, and finally,

4-arthropods are triploblastic because they are formed by three germ embryonic layers (endoderm, mesoderm and ectoderm).

answer; the code in musculoskeletal system subsection is associated with deep tissue possibly to the bone;