Based on the information why is it difficult to study the Amazon river dolphin

Name:
digestive system
fill in the words from the word band in the sentences belo
liver
large intestine
digestive system
word box
esophagus
anus
mouth
saliva
small intestine
1.
the
me uidebeen breaks down the food we eat.
when you chew and
2. digestions begins in the
swallow.
name
3. a watery liquid called
makes the food wet and
soft, and it has a chemical that digest the food.
4.
the
connects the bottom of your throat to your
stomach.
5. the
is a long narrow tube that has spongy walls
that soak up nutrients from food.
6. the
is on the right side of the body near the
lowest rib. its job is to clean the blood.