Animal Development

The animal's digestive tract forms from the _______.

• endoderm

• mesoderm

• ecotoderm

• protostome

The embryo layer that forms the skin and nervous tissue is the _____.

• endoderm

• mesoderm

• ectoderm

• deuterostome

If the opening in the gastrula turns into the organisms mouth then it must be a

• deuterostome

• protostome

• human

• dog

Animal with a mouth that does NOT develop from the opening in the gastrula.

• deuterostome

• protostome

• insect

• snail

A series of rapid cell division (w/o growth) that follows fertilization in animals is the stage of development called ____.

• sexual reproduction

• cleavage

• asexual reproduction

• binary fission

In more complex animal development, there are ___ germ layers that arise during early development.

• 2

• 3

• 4

• 5

What type of symmetry do humans have?

• radial

• asymmetrical

• bilateral

• equilateral

The image seen here represents a significant stage in animal development known as a/an ______.

• gastrula

• zygote

• egg cell

• blastula

The image shown represents another significant stage of animal development known as a/an ______.

• blastula

• zygote

• egg cell

• gastrula

The sea anemone shown here has what type of animal symmetry?

• bilateral

• asymmetrical

• radial

• equilateral