evolution

diversity

adaptation

fitness

homologous structures

natural selection

variation within a species

struggle for existence

classification

kingdom

phylum

class

order

family

genus

species

taxonomy

altermation of generations

haploid

diploid

sporophyte

gametophyte

bryophyte

antheridium

archegonium

vascular tissue

spores

tracheophyte

sporangia

prothalium

seed coat

endosperm

plant embryo

pollen

gymnosperm

angiosperm

cones

flowers

anther

pistle

stamen

filamen

sepal

ovary

ovule

petal

style

monocot

dicot

roots

stems

leaves

xylem

phloem

stomata

tropism

porifera

picules

collarcells

osculum

cnidarian

gastrovascular cavity

polyp

medusa

nematocysts

platyhelmenthes

bilateral symetry

radial symetry

parasite

nematoda

molluska

annelida

echinodermata

radula

mantle

open circulatory system

closed circulatory system

complete digestive system

segmentation

water vascular system

arthropoda

exoskeleton

endoskeleton

fishes

gills

operculum

amphibia

cutaneous respiration

vertebrate skeleton

double life of an amphibian

reptilia

aves

two chambered heart

three chambered heart

four chambered heart

amnionic egg

air sacs in bird lungs

mammalia

marsupial

placental

endotherm

ectotherm

monotremes