How does a new hypothesis replace an older explanation of something in the natural world? To understand this let us look at one of the classical example of geocentric theory and heliocentric theory. The geocentric theory states the Earth is at the centre of the solar system and the Sun, Moon, and all the other planets revolve around it. This ancient theory failed to explain the phenomenon like the phases of Moon, solar eclipse and lunar eclipse. The modern heliocentric theory which states that the Sun is at the centre of solar system, and all the planets including the Earth revolve around it. This theory was able to explain all the phenomenons unlike the geocentric theory. Hence the heliocentric theory replaced the geocentric theory.
The tongue has been considered as the strongest muscle yet it is a group of muscles. This is because it does not stop working. It is use if someone is eating, drinking, pushing the food as well as the liquid down to the throat and works to keep saliva out of one's mouth.
Except for e they tend to have low reproductive rates
D. Homeostasis- naturally selected function
