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39 terms

Science Chapter 1 Lesson 3

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verebrate
An animal with a segmented backbone.
chordates
Animals with nerve chords running down their backs.
endoskeletons
inner skeletons
bone and cartilage
endoskeletons are made of this.
bony fish
Examples are trout, salmon, tuna, goldfish. They have hard, bony skeletons and breathe through gills.
cartilage
Rays, skates and this sliky shark have skeletons made of these.
birds
They have jaws, feathers and hard, bony skeletons. They breathe through lungs.
reptiles
They have jaws, scales and hard bony skeletons.
examples of reptiles
snales, turtles, alligators and lizards.
mammals
They breathe through lungs and feed their young on mother's milk. Most live on land.
examples of mammals
humans, dogs, horses and whales.
tetrapods
Animals with four feet
bipeds
Animals with two feet.
invertebrates
animals without backbones
More than 95 of animals are these
invertebrates
arthropods
An invertabrate that has an external skeleton, a segmented body, and jointed appendages. Examples are insects, spiders, crab and shrimps.
flat and round worms
they live in water, in damp soil or inside other animals.
cnidarians
Examples are jellyfish, hydras and corals
Sponges
these belong to a phylum called Porifera.
Echinoderms
Examples are sea stars and sea urchins.
mollusks
examples are clams, snails, oysters, squid and scallops.
arthropods
these are invertebrates with tough exoskeletons
exoskeletons
tough outer skeletons cover the organisms bodies and protect the animals from danger.
crustaceans, insects and arachnids
groups of arthropods
crabs, shrimp and lobsters
examples of crustaceans
crustaceans
most abundant animals in the ocean, there are more than 30,000 species.
insects
largest group of arthropods.
insect body
these consists of a head, thorax and abdomen.
antennae and eyes
these help an insect sense the environment.
arachnids
there include spiders, ticks, scorpions and mites.
these have four pairs of appendages, one or two body sections and no antennae
arachnids
spiders
predators that feed mainly on insects.
parts of arthropods
abdomen, jointed legs, thorax, antennae and head
largest animals on earth
there are in the vertebrate class, not invertebrates.
These have stinging cells to capture fish
cnidarians
segmented worms
these have bodies separated into compartments.
Classes of vertebrates
reptiles, amphibians, birds and mammals.
jawless fish
these have soft skeletons and gills. specials include the hagfish and lamprey
lesson main idea
animals are classified according to whether or not they have backbones.