Answer:
Four.
Explanation:
Helen Fisher describes romantic love "as a very primitive, basic human emotion as basic as fear, anger or joy". She explained that men and women in prehistoric times who were in love were bound together in preparation for child bearing. But, after four years of raising a child through infancy, the love that once existed begins to wane. The couples tend to break up and search for new partners.
Glucose and oxygen is the products of photosynthesis
Answer:
The correct option is C.
repaying an oxygen debt.
Explanation:
This is because while running, humans breath shallowly which could not provide the oxygen requirement for the respiratory system and fit in for blood need.
After running, you tend to breathe heavily because your muscle work very hard , the body use more oxygen and produced more carbondioxide, therefore the lungs and respiratory system must try to provide more oxygen to the blood. sympathetic nerves stimulate respiratory muscles
so as to increase the rate at which we breathe.
<h2>Answer:</h2>
Option C is the correct answer.
C.The water molecules are repelled by the lipid tails of the cell membrane, but the carbon dioxide and oxygen molecules are not.
<h2>Explanation:</h2>
Lipids has two distinct portions. The heads of lipids are (Hydrophilic) and the tails of the lipids are (hydrophobic). So, as the tails of the lipids are hydrophobic i.e. water hating so they do not allow water molecules to pass from, while allow molecules of carbon dioxide and oxygen.