Animals #1
Animals without backbones
Invertebrates
__________ live on or in other living organisms.
parasites
__________ are the most numerous animals on the earth.
arthropods
__________ are the most familiar arachnids.
spiders
Animals that have two shells.
bivalve
Animals with backbones.
vertebrates
The living organism that parasites live on or in is called the __________.
host
arthropod means __________.
jointed foot
Insects have three body segments: __________,__________, __________
head, thorax, abdomen
Animals that have only one shell.
univalve
Percent of animals that are invertebrates.
95%
__________organisms live independently of other organisms.
free-living
An __________is a hard covering that acts like a knight´s armor, protecting an arthropod´s body.
exoskeleton
An insect becomes an adult through the process of __________.
metamorphosis
__________ is a bonelike substance, but it is softer and more bendable than bone.
cartilage
_______ symmetry means that animals have body parts that repeat around a central part.
radial
Birds are birds because they have __________.
feathers
Arthropod´s __________, or shed their exoskeleton and grow a new one.
molt
The term amphibian means _______.
double life
Most fish have skeletons made of _______.
bone
Many animals exhibit __________symmetry(mirror symmetry) which means if divided down the middle they would be the same on each side.
bilateral
Animals that are active at night.
nocturnal
Whales have a fatty substance called __________ that insulates them against cold.
blubber
__________ live part of their life in water and part on land.
amphibians
Are mammals warm-blooded or cold-blooded?
warm-blooded