Question

HELPPPP this is for science

What is the primary role of the respiratory system in living organisms?

to use up nitrogen

to make carbon dioxide

to find hydrogen

to obtain oxygen

Young tadpoles breathe like fish.

Which structure enables them to breathe in the water?

alveoli

trachea

gills

skin

The gas exchange in humans occurs in the alveoli where oxygen enters the blood stream and carbon dioxide enters the lungs for exhalation. What major organ are alveoli located in?

the bronchi

the lungs

the heart

the brain
_____ is a gas our cells need to perform cellular respiration. Without this gas, our cells could not survive.

oxygen

carbon dioxide

helium

nitrogen

_____ are tiny pores on the epidermis (skin) of plants that control gas exchange.

chloroplasts

nuclei

cellulose

stomata

Answer 1

Answer:the 1 is oxygen 2 is gills the 3 is the heart the 4 is helium the 5 is cellulose

Step-by-step explanation: