Answer:
The principal disadvantage of monogamy is a lack of variety. Monogamy has the potential to lead to routine, and possibly boredom. People often equate excitement in a relationship with the ability to be with a number of individuals, potentially as part of an open or sometimes polyamorous relationship.
Explanation:
Answer: pressure changes
Valves of the heart open and close due to pressure changes
Explanation:
The veins are the blood vessels possessing valves. And because they carry blood away from the heart, the valves helps to prevent back flow of blood due to the low pressure of blood found in the veins.
Thus, Valves of the heart open and close due to pressure changes
The answer is B- the forces air puts on the area around it.
Answer:
Also called Darwinian fitness, means the ability to survive to reproductive age find a mate, and produce offspring. Basically the more offspring an organism produces during its lifetime the greater its biological fitness.
Explanation:
