Protons are positive
electrons are negative
neutrons are neutral
If an atom gains an electron, it will have a negative charge.
Correct Answer is A. They were able to increase their productivity due to the popularity of tractors.
Answer:
Noble gases
Explanation:
Noble steam, any of the seven chemical elements that make up the periodic table in group 18.
Within normal conditions, noble gases are colorless, odorless, tasteless, and nonflammable gases. The noble gases are grouped according to their boiling point in the periodic table. Noble gases, from incandescent lamps to excimer lasers, are commonly used in distinct areas.
Planarias are flat worms that live freely in freshwater and sometimes in teh logs, soil, plants, or other dump or humid areas. They are from the class of Turbellarians. They have a very good ability in regeneration. They are acoelomerate which means that their body is very solid without any hollows.
They excrete unwanted objects from their body using their excretory system which is consists of series of tubes with length similar to their body length. The flame cells remove excess water through the use of the cilia and pass them to the ducts. At the end of the duct, there exist pores called the nephridiapores.
When a nerve impulse reaches the end of an axon, the axon releases chemicals called neurotransmitters. This would make the answer be.... A. a chemical signal is released