Answer:
You are saying which one but what is which one???
Explanation:
Answer:
basically every living thing breathes oxygen O2 and exhales carbon dioxide CO2
Explanation:
So orcas use O2 and produce then CO2.
Answer:
the corret answer is the sun
Explanation:
The Sun is the major source of energy for organisms and the ecosystems of which they are a part. Producers such as plants, algae, and cyanobacteria use the energy from sunlight to make organic matter from carbon dioxide and water.
The alveoli are lined with mucus and are surrounded by a network of blood capillaries. They have very thin walls for gases to be absorbed through. An individual air sac is called an alveolus. The layer of moisture in the alveoli allows gases to dissolve so that they can diffuse quickly.
<span>FOOD CHAINS FOLLOW A SINGLE PATH AS ANIMALS EAT EACH OTHER.
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<span>FOOD WEBS SHOW HOW PLANTS & ANIMALS ARE INTERCONNECTED BY DIFFERENT PATHS.</span>
