amphibian
anatomical
anatomy
animal
aorta
biology
blood
bones
brain
circulatory
dna
education
educational
examination
experiment
expertise
flat
frog
gene
genetics
genome
heart
icon
knowledge
lab
laboratory
learning
lesson
life
lungs
medical
medicine
microbiology
microscopy
model
molecule
mouth
nature
organ
organic
preparation
school
science
scientist
section
set
studying
system
test
university