Evolution of Animals

Question 1

Asexual

Answer 1

with self

Question 2

Fission

Answer 2

organism splits self in two, then regenerates its self

Question 3

Budding

Answer 3

a small growth on parent separates and matures

Question 4

Invertebrates

Answer 4

have a nervous system but no spinal cord

Question 5

Vertebrates

Answer 5

have spin

Bird, fish, amphibian, mammal

Question 6

Digestive tract

Answer 6

• was just a cavity with indentation, packman
• then developed anus became tube, formed digestive system
• then spinal cord developed
• the nervous system

Question 7

external fertilization

Answer 7

the egg is fertilized after left female

Question 8

internal fertilization

Answer 8

the egg is fertilized while in female