science Flashcards
what are the 4 characteristics that all animals share?
- multicellular
- heterotrophs
- reduce with sexual reproduction
- most can move from place to place
define vertabrate.
has a backbone
define invertabrate
doesn’t have a backbone
what are the 2 types of symmetry that animals can have?
bilateral and radial symmetry
define bilateral symmertry.
a line that divides it into halves that are mirror images
define radial symmetry
many lines of symmetry that go through a central point
what are the needs of all the animals?
food
water
oxygen
define vertebrae
a similar bone, lined up in a row
define ectothermic
cold blooded
define endotherms
warm blooded
what are the general characteristics of a fish
vertabrate
live in water
has fins used for moving
ectothermic
oxygen through gills
has scales
largest group of vertabrates
how do fish get their oxygen
they don’t stop swimming and the oxygen is filtered through the gills
how do fish reproduce
fish can do internal and external fertilization
what are the 3 different categories of fish?
- Jawless fish
- cartilaginous
- bony
what are the characteristice of jawless fish?
earliest vertabrate
no scales
skeleton made of cartilage
no pairs of fins
suck or stab their prey
what are the characteristics of cartilaginous fish?
skeleton made of cartilage
have jaws and pairs of fins
all carnivores
what are the characteristice of Bony fish?
skeleton made of hard bone
body covered with scales
most have swim bladder
body at different depths
what does the word Amphibian mean?
double life
