Chapters 29 to 34Here is how you will set up your foldable.
Animals
Invertebrates Vertebrates
Sponges
Mollusks
Annelids
Arthropods
Echinoderms
General Characteristics of Animals
Early Humans
Fishes
Amphibians
Reptiles
Birds
• Over 1 million species identified• They are classified by SIZE, SHAPE, BEHAVIOR.• Animals have the following in common:
-heterotrophs – get food from somewhere else
-mobility – can move
-multicellular – made of more than one cell
-diploid (one gene from mom and one from dad)
-sexual reproduction
-cell organization into tissue
-no cell wall on their cells• Evolutionary relationships determined by FOSSIL RECORDS.• Direct evidence of relationships by DNA.
The organism can be divided equally around a central point.
The organism can be divided equally in half. The right and the left sides are exact the same. HUMANS
Body Plan – describes the animal’s shape, symmetry and internal organization.
Let’s Practice SymmetryGrab a colored pencil
asymmetrical radial bilateral
• Are organisms that do not have back bones.
• Lack symmetry• They are a mass of specialized cells embedded in a gel-like
substance.• Sponges have three parts:
-ostia – tiny opening or pores where water enters.-oscula – where water exits.-sessile – where the sponge attaches to the bottom of the water.
• They get their food by filtering organisms out of the water.
Let’s see a sponge feeding!
Hydrozoans Scyphozoans Anthozoans
There are two shapes that cnidarians come in: medusa and polyp – radial symmetry
hydra jellyfish Coral and sea anemone
Attached to rocks or other objects
Free floating
Flatworms
- Found mostly in marine water.
- We usually study the planarian because it can live in captivity.
Roundworms
-mostly found as a parasite in dogs (canines)-They have long, cylinder-like bodies with a one way digestive system.-There are 50 species of roundworms that can do damage to animals, people or plants.
• Segmented worms (earthworms) – date back 530 millions years ago.• They believe that they originally lived in the sea and 2/3 still do.• They have very basic brains and a nerve chord under the body.• They have 4 major parts:
-digestive system-excretory system (poop)-circulatory system-locomotion – move with parapodia (bristle like structures)
• They are good on land because their waste contains nutrients for soil and they aerate the soil.
• Examples: snails, slugs, oysters, clams, scallops, octopuses and squid.
THEY ALL HAVE:• A body cavity called a COELOM. All organs are in the cavity,
suspended in fluid and attached to the body wall.
• Bilateral symmetry.
• They all have body systems
• Most have one or two shells (not all)
• Most have a radula for eating: used to scrape particles of food
The mollusks without shells via water jet propulsion - SQUID.
The mollusks with shells:A. Have three body parts (especially the ones with shells):
-mass – central section that contains organs.-mantle – heavy fold of tissue that makes up the outer
body.-foot – muscular region that is used for locomotion.
B. Many have shells that serve as PROTECTION and a place for MUSCLES TO ATTACH.
• Major Evolutionary Advancement is appendages – structures
that extend from the body and have joints.• They have a coelom and segmented bodies.• 2 groups– ones with jaws and ones with fangs/pincers.• Exoskeleton made of chitin, that is hard and surrounds the body.• To grow larger, they shed their exoskeleton and grow a larger
one.• Examples – centipedes, millipedes (eat decaying plants), ticks
(carry Lymes Disease), spiders, lady bugs, shrimp, scorpions, horseshoe crabs, grasshoppers, butterflies, crayfish.
Butterflies go through a
complete metamorphosis.
In a chrysalis
• They are spiny invertebrates that live on the ocean bottom.• Examples: sea stars, sea lillies, brittle stars, sea urchins, sea
cucumbers.• They are all very different but have 4 things in common.
-endoskeleton - skeleton made of calcium inside the body.
-5 part radial symmetry.
-Water vascular system – filter water for food and oxygen.
-Coelomic and respiration – to get rid of waste and breath through gills.
• The other group of echinoderms are called invertebrate chordates. They have an endoskeleton that includes a notochord – a stiff rode that runs down the back. They can move their bodies side-to-side.
Lancelet – resembles a fish. Cannot be found in shallow ocean water. Filters protists from the water.
Tunicates – Filter feeding marine animals
Chordates with a backbone that provides support, protects the dorsal chord and provides a place for muscle attachment .
• The backbone allows the organism to grow larger than an invertebrate. Got it’s name from the segmentated backbone.
• Bony skull to enclose brain that is higher functioning and can sense.
• Bilateral symmetry.• 2 pairs of jointed appendages (limbs or fins).• First vertebrates were fish.• First land vertebrates were amphibians.
ECTOTHERMICMetabolism too slow to maintain body heat so the organism has to absorb heat from the
environment.
ENDOTHERMIC
Can maintain constant temperature
by producing it internally.
Homo habilus
Handy Man
Tools
Homo erectus
Upright Man
Fire
Homo sapien
Wise Man
Abstract Thinking
Not all fish look “fishy”. There are three groups
MAJOR CHARACTERISTICS IN COMMON.
-Gills – they obtain oxygen (gas dissolved in the water) from the water.
-Swim Bladder – allows fish to go up and down in the water (bouyant)
-Single-loop blood circulation – blood pumps from the heart, to the gills, gills to the rest of the body and back to the heart.
-Vertebral column – have an internal skeleton made of cartilage or bone.
• Jawless – scaleless, eel-like fish with multiple gills and unpaired fins. Examples: lampreys and hagfish.
• Cartilaginous – Their bodies are all cartilage and strengthened by calcium carbonate. Examples: sharks, skates and rays.
• Bony Fish – Most and diverse group of fish. Strong internal skeleton made of bone. They have a swim bladder which regulates buoyancy.
Anatomy of a Fish
What adaptations were necessary for animals to live on land?
Legs
Lungs
Complex Heart Structure
• Examples: frogs, toads, salamanders and newts. • They all have four legs.• Partially divided heart – it has a right and left side.• They have lungs but they must live near water to stay
moist and breath.• Cutaneous respiration – they supplement breathing by
respiring through the skin.
Amphibians breath through lungs and skin.
• Strong body skeleton with toes and claws.• Ectothermic and breath through lungs.• Dry, scaly, almost water tight skin.• Lay eggs to reproduce (internal reproduction like birds).• Ventricle heart divided by septum.
Many people tend to be afraid of these organisms.
Crocodiles, alligators, lizards, turtles and snakes
SNAKES - different features; flexible body, swallow prey whole, lack moveable eyelids and external ears).
• They retain many characteristics of reptiles but have the ability to fly.
• Lack teeth.
• Reduced tail length.
• Front limbs are wings not legs.
• Bodies covered in feathers which are MODIFIED SCALES – the body secretes oil from the PREEN GLAND to waterproof the feathers.
• Light and hallow bones.
• Endothermic metabolism.
• Great respiratory system for flying long distances.
• Heart divided into 4 chambers, divided by a septum, like mammals.
