There are many different cycles in nature, such as the cycle of seasons.
A cycle is a series of events that repeat, such as the daily cycle of light and dark.
(The time it takes for a cycle to repeat itself is its period.)
To evolve means to change or improve over a period of time.
In biology, the theory of evolution says that advanced life forms such as humans have evolved from lower forms of life.
(Life forms evolve because they have to adapt in order to survive.)
A force of attraction brings two objects closer together, such as the force of gravity.
A force of repulsion pushes two objects away from each other, such as the force between two electrons.
(Gravity is a force of attraction between two objects with mass.)
To transform means to change from one form into another.
A transformation occurs when an object takes on a new appearance or structure.
（Over a period of time，the process of evolution can transform the appearance of a species of life.）
To inherit something means to get it without having to ask or work for it.
A child from a very rich family may inherit a lot of money.
(Eye and hair color are inherited traits.)
If two people are attracted to each other they want to be together.
网友评论