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define gastrulation
early developmetal process in which an embryo is transformed from a blastula to a gastrula
what is an archenteron?
cavity within an embryo at the gastrula stage of development that eventually becomes the digestive cavity.
what is a body plan?
a set of morphological and developmental traits, intergrated into a functional whole living animal.
name the characteristics which explain body plan?
symmetry, cephalization, tissues, body cavities, protostome and deuterostome development.
explain cephalization
cephalization is the concentration of nervous tissue that leads to the early development of the brain
DEFINE TISSUES?
Tissues are collections of specialized cells
distinguish between diploblastic and triploblastic animals
diploblastic animals have both the ednoderm and the ectoderm meanwhile triploblastic animals have all three germ layers which are the mesoderm, endoderm and the ectoderm.
define a body cavity?
a fluid-filled space inside the body that holds and protects internal organs.
what is a true body cavity called?
a coelom
what are animals in possession of a true body cavity called?
coelomates
where is a true body cavity derived in triploblastic animals?
mesoderm
what is the rapid cell division undergone by a zygote clled?
Cleavage
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