What is the process where a fertilized egg becomes a multicellular zygote called?
Cleavage
What is it called when the cells of a blastula move inside the ball to create layers?
Gastrulation
What are the 3 germ layers most animals produce during their development?
Endoderm
Mesoderm
Ectoderm
What do animals with 2 germ layers typically exhibit?
Radial symmetry
What do animals with 3 germ layers typically exhibit?
Bilateral symmetry
What does the endoderm form?
The lining of the digestive tract
Ectothermic animals are incapable of doing what?
Regulating their own body tempurature, their internal temperature rising and falling depending on their surroundings
Which of the following describes animals in Phyla Porifera?
What is mesenchyme?
The jelly-like substance in between the cellular layers of sea sponges
What are amebocytes?
A group of specialized cells that helps sea sponges with digestion and gas exchange
What are collar cells?
A group of specialized cells found inside the body cavity of sea sponges which helps the organism trap food
Sea sponges are…
Segmented worms are in the phylum…
Annelida
Flatworms are in the phylum…
Platyhelminthes
All three phyla of worms have several things in common. Which is not a characteristic they have in common?
senseing light
Which of the worms has the most developed nervous system?
Segmented worms
Hermaphroditic worms…
Have both male and female reproductive organs
What do Parasitic worms do
Live on or in another organism and benefit by taking nutrients at the expense of the host organism
A solex is…
A small knob-like head with suckers and hooks
A ganglion is…
A mass of nerve cells that functions like a simple brain
A complete digestive system is one that…
Has both a mouth and anal opening
Tapeworms are a type of…
Flatworm
Leeches are a type of…
Segmented worm
Flukes are a type of…
Hookworms are a type of…
Roundworm
Animals in Phylum Cnidaria get their name from their cnidocytes which are what?
Stinging cells
Cnidarians all have 2 germ layers which together make up what?
Their epithelial cells
A cnidarian that is sessile, cup-shaped, has a mouth and tentacles at one end, and a sticky base that attaches to a hard surface on the other end is called what?
Polyp
A cnidarian that is motile with an umbrella-shaped body with its mouth facing downward and tentacles extending around it is called what?
Medusa
Hydra are part of which class of cnidarians?
Hydrozoa
Jellyfish are part of which class of cnidarians?
Scyphozoa
Coral are part of which class of cnidarians?
Anthozoa
What does echinoderm mean?
Spiny skin
Sea stars are part of which class of echinoderms?
Asteroidea
Brittle stars are part of which class of echinoderms?
Ophiuroidea
Sand dollars are part of which class of echinoderms?
Echinoidea
Sea cucumbers are part of which class of echinoderms?
Holothuroidea
Echinoderms do NOT have which of the following systems?
What do echinoderms use for capturing prey, eating, and movement.
Tube Feet
What is only found in animals or organisms in Phylum Echinodermata?
Water vascular system
What are some characteristics of arthropods?
Hard exoskeleton.
Well-developed nervous system.
What does open circulatory system mean?
Blood empties straight into the creature’s cavities and does not use a complex set of blood vessels.
What are some characteristics of insects?
Compound eyes
6 walking legs
Pair of antennae
3 body parts
What is a cephalothorax?
A fused head and thorax segment
The labrum, mandibles, maxillae, and labium are all parts of an insect’s…
Mouth parts
Some insects go through incomplete metamorphosis, which goes through what stages? (In order)
Egg
Nymph
Adult
Some insects go through complete metamorphosis which goes through what stages (in order)
Larva
Pupa
What is a nymph?
An immature form of an insect that resembles a miniature adult but is not able to reproduce
Crustaceans include what animals?
Lobsters
Crayfish
Shrimp
What are some characteristics of crustaceans?
2 pairs of antennae
2 body segments
10 legs
Chelicerates include what animals?
Spiders
Ticks
Scorpions
What are some characteristics of arachnids?
No antennae
8 legs
What is one thing centipedes and millipedes have in common?
A lot of body segments
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