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What is an Animal?
Animal Body Plans
Invertebrates
Vertebrates
Vertebrate Diversity
100
Which of the following is a characteristic shared by all animals? 1: Their bodies have many cells. 2: They eat plants. 3: They reproduce asexually. 4: They have skeletons.
Their bodies have many cells.
100
True or False: Animals must maintain a stable environment within their bodies to survive.
True
100
True or False: Most animals are invertebrates.
True
100
An animal that has a backbone is called a ________________.
vertebrate.
100
Animals in the mammal group called ______________________ allow their young to develop in a pouch on their mother's body.
marsupial
200
Major functions of animals include obtaining food and oxygen, keeping internal conditions stable, movement, and ______________.
reproduction.
200
An animal may have radial symmetry, bilateral symmetry, or ____________________ symmetry.
no symmetry.
200
True or False: A type of worm with many linked sections is a flatworm.
False: segmented worm
200
What does the backbone surround and protect in a vertebrate?
The spinal cord.
200
Mammals and _____________ are the two groups of vertebrates that are endotherms.
birds
300
Classifying animals involves comparing their _____________________, a chemical that controls an organism's inherited characteristics.
DNA
300
If only one line can divide an object into mirror-image halves, the object is said to have ____________________ symmetry.
bilateral symmetry
300
An __________________ has a system of fluid filled tubes for obtaining food and oxygen.
echinoderm
300
An ectotherm's body temperature changes depending on the temperature of its ______________________.
environment.
300
What is the name for the group of mammals that lay eggs?
Monotremes
400
Define homeostasis.
The process through which animals keep internal conditions stable.
400
What are the 4 levels of organization in a human's body?
Cells, tissues, organs, organ systems
400
An asymmetrical animal without tissues or organs.
Sponge.
400
True or False: The nerve cord is a flexible rod that supports a chordate's back.
False: Notochord
400
List the 3 different types of fish.
Bony fish, jawless fish, and cartilaginous fish.
500
When you look at a branched diagram that classifies animals, how can you tell how closely related two groups of animals are?
Animals on groups of nearby branches are more closely related than groups on branches that are farther apart.
500
Contrast the ways in which bilaterally symmetrical animals and radially symmetrical animals move. Explain how each kind of symmetry influences the way in which an animal moves.
Animals with radial symmetry generally do not move fast. They stay in one spot, are moved along by water currents, or creep along the bottom of the water. In contrast, animals with bilateral symmetry can usually move more quickly than animals with radial symmetry, partly because their bodies are often streamlined. In addition, the bodies of bilaterally symmetrical animals have distinct front ends that typically go first as the animal moves along.
500
Describe a characteristic of arthropods that enables them to survive on dry land.
Arthropods have waxy exoskeletons that prevent water from evaporating from their bodies.
500
What is an endotherm? How do sweating, fur, and feathers affect the body temperatures of endotherms?
An endotherm is an animal whose body regulates its own temperature by controlling the internal heat it produces. An endotherm is cooled when sweat evaporates. Fur and feathers help keep endotherms warm on cool days.
500
What are two differences in the way birds and most mammals reproduce and care for their young?
Most mammals bear live young; birds lay eggs. Mammals feed their young with milk; birds do not.