chapter 12: introduction to animals. aim: what are the characteristics of all animals?
TRANSCRIPT
Chapter 12: Chapter 12: Introduction to Introduction to AnimalsAnimals
Aim: What are the Aim: What are the characteristics of all characteristics of all
animals?animals?
Animal CharacteristicsAnimal CharacteristicsCopy 6 characteristics on pg 330
Aim: How do animals adapt to Aim: How do animals adapt to survive?survive?
Adaptations for Obtaining Adaptations for Obtaining EnergyEnergyAll animals need food and eat
different kinds of food1.Herbivores-eat more often and
greater amounts b/c plants don’t give as much energy as other foods
2.Carnivores-capture and kill for foodSome are scavengersDon’t eat as often or as much as
herbivores b/c meat provides more energy
3. Omnivores Have more sources of food
4. Detritivores Feed on tiny bits of decaying
matter Exs: millipedes and beetles
Physical AdaptationsPhysical Adaptations1. Physical Features (protect
animals from predators) Outer coverings-pill bugs Hard shells-turtles Quills-porcupines2. Mimicry Animal closely resembles another
animal in appearance or behavior Predators have difficulty
distinguishing between them and won’t attack either animal
Ex: venomous coral snake and the non-venomous scarlet king
Can be a disadvantage for scarlet king b/c people mistake them for coral snake and kill them
3. Camouflage Helps animals blend into their
environment and hide from their predators
Ex: English peppered moth and lichens
Ex: trout Ex: cuttlefish-can change color
Predator AdaptationsPredator Adaptations1. Camouflage Used by predators to sneak up on
their prey Ex: tiger’s stripes hides them in tall
grasses Killer whales-black on top and
white underneath When viewed from top they blend
in with the ocean When viewed from the bottom they
blend in with sky
Behavioral AdaptationsBehavioral AdaptationsEnable animals to capture prey or
avoid predatorsSkunk spray liquid to keep
predators awayOctopus- releases cloud of ink to
escape predatorsGazelle can outrun it’s predators
(speed)Wolves travel in packs, which
enable them to hunt large prey
Aim: How are animals Aim: How are animals classified?classified?
Aim: What are the Aim: What are the characteristics of characteristics of
sponges?sponges?
SpongesSpongesAre homes for many animals, such
as shrimp and snailsFood source for sea stars and fishSome used for bathing and
cleaningAppeared on earth 600 million
years agoEvolved separately from all other
animals b/c they have little in common with other animals
Characteristics of Characteristics of SpongesSpongesColors, shapes and sizes varySaltwater-blue, red, orange or yellowFreshwater-dull brown or greenAre sessileFound in coloniesBody is a hollow tube, that is closed
at the bottom and open at the topHas many poresNo tissues, organs or organ systems
Collar cells line the inside of the sponge and moves water into the sponge
Spicules and spongin provide support and help protect against predators
Eat microscopic organisms, such as bacteria, algae, and protists
Food and oxygen enter through the spores
Wastes travel out through opening in at the top
Can reproduce sexuallyMost are hermaphroditesSponge’s own sperm can not
fertilize its own eggCan reproduce asexually through
budding and regeneration
Aim: What are the Aim: What are the characteristics of characteristics of
cnidarians?cnidarians?
CnidariansCnidariansIncludes corals, sea anemones,
hydras, jellyfish and Portuguese man-of-war
Most live in saltwaterMany types of hydras live in
freshwater2 body forms1.Polyp: shaped like a vase and
sessile2.Medusa: bell-shaped and free
swimming
Characteristics of Characteristics of CnidarianCnidarianHave one body openingRadial symmetryHave cells that are arranged into
tissuesHave a digestive cavityNerve net-system of nerve cells
that enables them to conduct simple movements and responses
Have tentaclesTentacles have a stinging cell that
help cnidarians capture food
Are predatorsReproduce asexually and sexuallyPolyp forms reproduce asexually
by buddingPolyp forms can reproduce
sexually by producing egg and sperm
Medusa forms have a sexual and asexual stage of reproduction
Aim: Why are corals Aim: Why are corals important?important?
CoralsCoralsCoral reefs are formed by corals
secreting their hard external skeletons on to earlier generations
Takes millions of years for large reefs to form
Has a great diversity of lifeHelp protect beaches and
shorelines from the action of waves
Home for organisms that provide us with valuable shells and pearls
Chemicals released by corals may provide humans with drugs to fight cancer
Some coral can be used to replace human bone
Aim: What are the Aim: What are the characteristics of flatworms?characteristics of flatworms?
Aim: What are the Aim: What are the characteristics of characteristics of
roundworms?roundworms?
RoundwormsRoundwormsAka nematodesFound in soil, animals, plants,
freshwater, and saltwaterMost are free-livingSome are parasitic2 body openings, a mouth and
anusReproduce sexuallyBody is a tube within a tube
Some cause disease in humansCause damage to fiber, agricultural
products and foodSome are beneficial b/c they feed
on fleas, termites, ants, beetles and many other insects
They provide nutrients to the soil as they breakdown organic material
Help in nitrogen cycle