Name and identify five types of movements of cells during gastrulation in animals.
a) Ingression - Cells move into the embryo interior.
b) Delamination - Splitting of cell layers.
c) Involution - Cells migrate inwards and spread beneath the surface layer.
d) Epiboly - Cell layers move over one another.
e) Convergent extension - Cells intercalate and elongate, causing tissue lengthening.
