Sort the features and characteristics by the groups they are found in. metamorphosis amniotic eggs ectothermic scales spinal cord gills in adults lungs in adults external fertilization

Metamorphosis - amphibians, fishes, insects

• Biological process of animal's growth and physical development through sages characterized by the change in body structure

Amniotic eggs - reptiles, birds, mammals

• The eggs are not laid in the water and contain membrane that covers the embryo (amnion)

Ectothermic scales - fishes, amphibians, reptiles, and invertebrates

• Body temperature depends on environment

Spinal cord - vertebrates

• a hollow tube of nervous tissue part of CNS

Gills in adults - insects, mollusks, crustaceans, amphibians, fishes

• respiratory organ in aquatic animals

Lungs in adults - birds, reptiles, mammals, some fishes and some amphibians

• respiratory organ for the extraction of oxygen from the atmosphere

External fertilization - amphibians and fishes, some invertebrates such as coral and sea anemones

• fertilization outside of the female's body (usually in water).