表皮
anatomy
background
biological
biology
botanical
botany
carbon
cell
chlorophyll
chloroplast
dioxide
discovery
education
experience
green
guard
laboratory
leaf
learn
life
macro
manufacturing
micro
microbiology
microorganism
microscope
microscopic
nature
nucleus
observation
organic
oxygen
pathology
photosynthesis
plant
pore
preparation
process
progress
research
respiration
science
scientific
stoma
stomata
structure
texture
tissue
vacuole