Living Things Benchmark

All vertebrates have muscles, protective skin covering, a nervous system, and a(n) _____.

• endoskeleton
• exoskeleton
• endothermic
• ectothermic

All animals are multicellular heterotrophs that gain energy from outside sources, grow and develop, reproduce, and ____.

• respond to stimuli
• make their own food
• have an endoskeleton

Arthropods have an external covering called the ______.

• exoskeleton
• endoskeleton
• air tube
• ectothermic

Sea urchins are classified as

• mollusks
• echinoderms
• arthropods
• amphibians

The only group of animals that begin their lives breathing through gills in the water and as adults can live on land breathing with lungs

• amphibians
• arthropods
• mammals
• fish

The simplest type of invertebrate with holes and pores to filter water

• sponge
• segmented worms
• arthropods
• mollusks

Endothermic vertebrates with feathers, beaks, two legs, and lay eggs

• bird
• mammal
• fish
• reptile

An invertebrate who has jointed legs, segmented body, and an exoskeleton

• arthropod
• amphibian
• segmented worms
• echinoderm

Ectothermic animals with dry scales or plates that lay eggs

• fish
• amphibian
• reptile
• bird

Invertebrate who has a central cavity and a body that extends from the middle outward

• mollusk
• echinoderm
• arthropod
• segmented worm