Animal Structure and Development

How many cells does a zygote contain?

• 1
• 2
• 3
• 4

What is a blastula?

• Opening to ball of cells
• Hollow ball of cells
• A fertilized egg
• An indention in a ball of cells

Where is the endoderm?

• Inner layer
• Middle layer
• Outer layer

Where is the ectoderm?

• Inner layer
• Middle layer
• Outer layer

Where is the mesoderm?

• Inner layer
• Middle layer
• Outer layer

What does the mesoderm become?

• Skin
• Digestive system
• Muscle
• Brain

What does the endoderm become?

• Skin
• Muscle
• Digestive system
• Bones

Which type of animal has no body cavity?

• Acoelomate
• Pseudocoelomate
• Eucoelomate

Which type of animal has a body cavity with only one layer of muscle?

• Acoelomate
• Pseudocoelomate
• Eucoelomate

What is the scientific name for animals that don't have backbones

• Vertebrates
• Invertebrates
• Boneless