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24 terms

Life Science Ch. 9 Vocabulary Sections 1-4

STUDY
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cell
The basic unit of structure and function in living things
tissue
A group of similar cells that perform a particular function
organ
A structure in the body that is composed of different kinds of tissue
adaptation
A behavior or physical characteristics that allows an organism to survive or reproduce in its environment
sexual reproduction
A reproductive process that involves two parents that combine their genetic material to produce a new organism, which differs from both parents
fertilization
The joining of a sperm cell and an egg cell
asexual reproduction
A reproductive process that involves only one parent and produces offspring that are identical to the parent.
Phylum
One of the major groups into which biologists classify members of the animal kingdom
vertebrate
An animal that has a backbone
invertebrate
An animal that does not have a backbone
bilateral symmetry
Body plan with two halves that are mirror images
radial symmetry
The quality of having many lines of symmetry that all pass through a central point.
larva
The immature form of an animal that looks very different from the adult
cnidarian
An invertebrate animal that uses stinging cells to capture food and defend itself
polyp
The cnidarian body plan characterized by a vaselike shape and which is usually adapted for life attached to an underwater surface.
medusa
The cnidarian body plan characterized by a bowl shape and adapted for a free-swimming life.
colony
A group of individual organisms living or growing together
coral reef
A diverse environment named for the coral animals that make up its stony structure
parasite
The organism that benefits by living on or in a host in a parasitism interaction
host
The organism that a parasite or virus lives in or on
free-living organism
An organism that does not live in or on other organisms
scavenger
A carnivore that feeds on the bodies of dead organisms
anus
A muscular opening at the end of the rectum through which waste material is eliminated from the body
closed circulatory system
A circulatory system in which blood moves only within a connected network of tubes called blood vessels