Animal Diveristy

A ___is limbless cold-blooded vertebrate animal with gills and fins and living in aquatic ecosystems.

• amphibian

• reptile

• fish

• mammal

A _____ is a tool that allows the user to determine the identity of living organisms in the natural world

• Darwin's Key of Evolution

• Dichotomous Key

• Scientific Key

• Paleethnology's Key

Poikilothermic means that an animal is ____.

• warm-blooded

• hot-blooded

• homothermic

• cold-blooded

Fishes, amphibians, reptiles, birds, and mammals, including humans, are all ___ because they have a back bone.

• exoskeletals

• vertebrates

• invertebrates

• transvertebrates

A platypus is the only ____ that can lay eggs.

• fish

• bird

• reptile

• mammal

A ___ is an animal with structural adaptation such as a beak, claws and feathers.

• fish

• bird

• reptile

• amphibian

An ____ is an animal without a backbone.

• invertebrate

• vertebrate

• convertebrate

• transvertebrate

A hollow backbone and the cranium, or skull, protect the ______ of most vertebrates.

• spinal cord and brain

• heart and lungs

• brain and heart

• spinal cord and liver

____ are animals that are distinguished by having an aquatic gill-breathing larval stage followed by a terrestrial lung-breathing adult stage.

• Birds

• fish

• Amphibians

• Arachnids

____ are air-breathing, cold-blooded vertebrates that have scaly bodies rather than hair or feathers and can lay eggs.

• Insects

• Reptiles

• Mammals

• Crustaceans