5,000 living sponge species
Three Main Groups:
hexactineuida (glass sponges)
calcarea (calcareous sponges)
no coelom, organs, or skeleton
no urinary, cardiovascular, respiratory or nervous system
Differences in animals are brought about by 2 groups of factors: genetic and envir onmental factors.
One set of differences is said to be the animals phenotype.
Phenotypes are the physical appearance of the animal.
the study of the interactions of living things with each other and their physical en vironment
Population: all the members of a species inhabiting a given location
Community: all the interacting populations in a giv
In the United States alone, there are 986 endangered species (388 animals, 598
plants). Also listed are 276 species which are threatened (129 animals, 147
In the world, 1072 animal species are considered endangered or threat
A population is the number of a species living in a particular area
What factors could change a population?
What else can affect the numbers and the distribution of
Includes snails and slugs, oysters and clams, and octopuses and squids.
Covered with protective mantle that may or may not form a hard, calcium carbon ate shell
Have a muscular foot for mov