SPONGES & CNIDARIANS
Sponges are the ______________ of animals
Most simple (simplest)
Flatworms and roundworms have _____________ symmetry
Bilateral
Echinoderms use ___________ to move
Tube feet
Arthropods are the _____________ group of invertebrates
Largest
Mollusks live on land, in freshwater or ____________
The ocean
Name two examples of cnidarians
Jellyfish, corals, hydras, sea anemones
Segmented worms have bodies that are divided into many __________________
Sections or segments
Contrast radial symmetry with bilateral symmetry
Radial symmetry: body parts that are arranged like spokes on a wheel
Bilateral symmetry: bodies have a left half and a right half that are the same
Most insects go through _______________.
Describe this process
Changes in form during development in which earlier stages do not look like the adult
All mollusks are divided into three body parts:
Head, body, and foot
Sponges consist of two layers of cells and have no _____________ or ___________
Organs
Tissues
Most roundworms are ____________
a. Parasitic
b. Not Parasitic
b. Not parasitic
Most _____________ are parasites that live on or inside other animals
a. flatworms
b. roundworms
c. segmented worms
Flatworms
All arthropods have an external skeleton. In order for arthropods to grow, they must go through a process called ______________.
Describe this process
Molting
The arthropod starts to produce a new skeleton before it molts (sheds its old exoskeleton). It takes a few days to harden completely
The largest group of mollusks include __________ and ____________
Snails and slugs
How do sponges feed?
Sponges strain food particles out of the water as the water enters through pores in the body wall.
Leeches are parasites that attach to a vertebrate's skin and feed on its blood. Leeches are an example of a ______________
a. flatworm
b. roundworm
c. segmented worm
Segmented Worm
What is incomplete metamorphosis?
Changes in form during development in which earlier stages look like the adult
Suppose you found a small arthropod under a rock. Using only a hand lens, how could you tell whether the animal is an arachnid or an insect?
Arachnids have four pairs of legs. Examples: spiders, scorpions, mites, and ticks
Insects are the only invertebrates that can fly and have three pairs of legs
Echinoderms have ____________ symmetry.
Which other group have this symmetry?
Radial
Cnidarians
Cnidarians have ___________ symmetry and use ______________ to capture prey
Radial
Tentacles
Give an example of a flatworm, a roundworm, and a segmented worm
Flatworm--tapeworm, flukes, planarians
Roundworm--hookworm, human roundworm, guinea worm
Segmented Worm--earthworm, leeches
DAILY DOUBLE: Name one example from the following groups of invertebrates:
cnidarians, segmented worms, mollusks, arthropods, echinoderms
jellyfish
earthworm
oyster
butterfly
sea star
What are the five groups of Arthropods?
Crustaceans
Arachnids
Centipedes
Millipedes
Insects
Name three examples of Echinoderms
Sea stars
Sea urchins
Sand dollars
Sea cucumbers