An oxygen atom is what is found on the periodic table. The Oxygen atom is made of 8 proton, 8 electrons and generally 8 neutrons.The oxygen molecule is made of two oxygen atoms that have formed a double bond with each other and share valence electrons.

Explanation:

8 0

3 years ago

In animals, carbon dioxide waste is exchanged for

LUCKY_DIMON [66]

Answer:

oxygen

Explanation:

Through the process of respiration , in lung the carbon dioxide from the blood is exchanged with oxygen.
The smallest dunctional unit if the lung is the alveoli
At this level the gases are exchange through the capillaries present close to the alveoli.
The concentration gradient ,meaning the greater amount of oxygen present in the lungs and greater amount of carbon dioxide in the blood creates a gradient that allow the movment of oxygen into the blood and carbon dioxide in the alveoli through the membrane .
Partial pressure created allows the easy movement .The carbon dioxide get into the trachea and expelled through nose and mouth.

3 0

3 years ago

Which of the following is NOT an example of a physical change?

Natasha2012 [34]

Answer:

Solution : Combustion of Liquefied Petroleum Gas (LPG) is a chemical change. Because it is an irreversible reaction and new products, carbon dioxide and water vapour are formed and lot of heat is also produced during the reaction.

6 0

2 years ago

A landfill is an area that has been cleared out in order for humans to dispose of waste products.

choli [55]

B. Soil Contamination

All the other answers are talking about clean and pure things while this answer is the only negative one. So B is your answer.

8 0

2 years ago