Explanation:The excretory system is the system of an organism's body that performs the function of excretion, the bodily process of discharging wastes. ... There are several parts of the body that are involved in this process, such as sweat glands, the liver, the lungs and the kidney system. Every human has two kidneys.
The nucleus is where genetic information is found.
Answer:
convection currents move plates and when plats collide and separate they can make things like mountains , trenches, and volcanoes
Changes in temperature, salt concentration, ionic concentration, of pH levels
Answer: A lack of positive external signals causes cells to stop dividing. Cells are also able to sense their surroundings and respond to changes. For instance, if a cell senses that it is surrounded on all sides by other cells, it will stop dividing.
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