How many cells does the human body have, and how many different types are there?

There are about 200 different types of cells in the body, from adipose cells, which act as stores of oil or fat, to mammary-gland cells, which can secrete milk in female breasts. Although they perform different functions, cells tend to have the same basic structure.

There is around 20 different types of cells.

before, trains worked using the steam engine. thus, it uses heat so it is crucial to apply heat balance. the steam engine absorbs energy during the stage of boiling water. so, this is the endothermic reaction. when the steam is used to work the piston, it has to release this energy through running the train. the excess energy is released as an exhaust to the chimney. this is the exothermic process because it releases energy to the surroundings.

which

what is a measurement of the earth’s history divided into time periods?

> fossil record <

sedimentary rock

> geologic time scale <

radioactive elements