The house is made of bricks, and in any living creature (human, animal or plant) such bricks are called cells. There are many cells in the human body: if you put all the cells in a row, this chain can wrap the Earth around the equator 100 times. Three main parts can be distinguished in the structure of the cell: the membrane, the cytoplasm, the nucleus.All cells in the human body are very small, so we cannot see or feel them. They are less than 10th of a millimeter. The cells of the human body are different in shape because they perform different functions. Muscle cells are long and thin, like threads. The nerve cell is similar to an octopus - a thick body with tentacles, some of them are short and highly branched, others are long with processes up to 1.5 meters. A cell is a living organism that feeds, breathes, grows and dies. Without food, oxygen and work, the cell dies. Therefore, a person needs to regularly eat, breathe fresh air and move in order for the cells to work properly and multiply.
1. Tracy is never happy.
2. Bob is usually glad to see us.
3. We sometimes go for a walk .
4. I always come to the station in time.
5. They are seldom in here.
6. Ada rarely looks cheerful.
7. They are usually here.
8. We often dance at the parties.
9. Teddy never lends money to his friends.
10. The boy is seldom upset.
11. Our children are always here.
12. they usually clean their house on Friday.
13. I always swim in the swimming pool in the morning.
14. Cora is rarely at this place.
15. our dog sometimes barks at night.
Объяснение:
The house is made of bricks, and in any living creature (human, animal or plant) such bricks are called cells. There are many cells in the human body: if you put all the cells in a row, this chain can wrap the Earth around the equator 100 times. Three main parts can be distinguished in the structure of the cell: the membrane, the cytoplasm, the nucleus.All cells in the human body are very small, so we cannot see or feel them. They are less than 10th of a millimeter. The cells of the human body are different in shape because they perform different functions. Muscle cells are long and thin, like threads. The nerve cell is similar to an octopus - a thick body with tentacles, some of them are short and highly branched, others are long with processes up to 1.5 meters. A cell is a living organism that feeds, breathes, grows and dies. Without food, oxygen and work, the cell dies. Therefore, a person needs to regularly eat, breathe fresh air and move in order for the cells to work properly and multiply.