Answer:
the correct answer is b, c, d
Explanation:
i just took the quiz on usatestprep
In this system, the process of digestion has many stages, the first of which starts in the mouth.
Digestion involves the breakdown of food into smaller and smaller
components, until they can be absorbed and assimilated into the body.
Answer:
So they are lighter and move quicker.
Explanation:
With the small wings and bodies birds have it would be hard for them to escape predators and lift their own weights if their bones were dense like humans' bones. The hollow part of the birds' bone is connected to their lungs so they have enough oxygen to fly easily. Hope this can help you! :)
Nostrils- Nasal chambers - Internal nares - Laryngopharynx - Larynx - Trachea - Primary bronchi - Diaphram - Lungs- Bronchial intercom - Alveoli.
I hope it helped u..!!