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organs
system
nerves
skeletal
bones
muscles
circulatory
oxygen
digestive
breathing
reproductive
muscular
skeleton
bone marrow
skull
vertebrae
spine
rib cage
jawbone
minerals
rocks
crust
magma
igenous
fiery
volcano
lava
granite
mica
quartz
feldspar
basalt
pumice
sedimentary
sediment
fossil
shale
sandstone
conglomerate
limestone
calcite
chalk
metamorphic
metamorphosis
slate
quartzite
gneiss
cement
metals
ores
gemstone
fuels
coal
petroleum
ribs
marble
diesel
pollutants
ecoloy
acid rain
fertiliser
medicine
cosmetic
hazard
soil
bacteria
plants
weathering
pebbles
topsoil
erosion
deforestation
conservation
afforestation
terrace
embankments
shelter belts
soil cover
farming
flooding
voluntary
cardiac
backbone
hinge
pivot
involuntary
ligaments
tendon
humerus
femur
calf bone
biceps
triceps
joints
gliding
elbow
ankle
seeds
spores
bryophyllum
runners
cotyledons
embryo
germination
seedling
dispersal
kharif
rabi
crops
reproduction
agents
dandelion
maple
cotton
moisture
petrol
pollution
wind mill
ecologists
environment
natural