section 1 what is an animal chapter 9
cell
(biology) the basic structural and functional unit of all organisms
How are animals classified?
1.by how they are related to other organisms 2.by animal body structure 3.by the way the animal develops 4.DNA
vertebrate
An animal with a backbone
invertebrate
An animal without a backbone
Why is movement important to organisms?
Meeting the basic needs of survial and reproduction
adaptation
a behavior or physical characteristic that allows an organism to survive or reproduce in its environment
tissue
a group of similar cells that perform the same function
asexual reproduction
a reproductive process that involves only one parent and produces offspring that are identical to the parent
sexual reproduction
a reproductive process that involves two parents that combine their genetic material to produce a new organism, which differs from both parents
organ
a structure in the body that is composed of different kinds of tissue
How do animals obtain food?
eating other organisms
phylum
one of the major groups into which biologists classify members of a kingdom
How are animal bodies typically organized?
the cells cells of most animals are organized into higher levels of structure, including tissue, organs, and systems
fertilization
the joining of a sperm cell and an egg cell
What are four major functions of animals?
the major functions of animals are to obtain food and oxygen and water, keep internal condititions stable, move, and reproduce
