?
mouth
?
esophagus
name five organs in the digestive system
mouth, esophagus, stomach, small intestine, large intestine
?
stomach
?
intestine
What happens when 2 eggs are fertilised or one egg divides in two during reproduction?
twins
?
lungs
Human beings are _______.
viviparous
name four organs in the respiratory system
nose/nostrils, trachea, lungs, and diaphragm
?
kidney
name four organs in the excretory system
kidneys, ureters, bladder and urethra.
?
bladder
?
ureters
?
urethra
?
heart
?
diaphragm
