Answer:
4
Explanation:
Products made from fossil fuels are versatile
Fossil fuels can be made into many types of energy. Coal can be used to create electricity. Oil is used to create combusting products like gasoline for transportation and heating. Natural gas is often used for heating and combustion energy as well.
To understand the global systems and the changes they undergo in a better way, we can use a model to represent the various ecological processes that occur within the biosphere. One example of a model that we can use is the earth systems model.
Answer:
los hepatocitos son el principal tipo de células del hígado. los hepatocitos se combinan para formar el siguiente nivel más complejo de organización llamadotejido
Hey There!
Here is your answer:
Your answer is that a experiments should be controlled because the experiment could go out of control which could harm or hurt someone.
Also the definition of a controlled experiment is a part of the experiment that's not touched.
Ex: Water is your controlled experiment that's because our not doing anything to the water.
If you need anymore help just ask me!
Hope this helps!
