Which process is a cause of variation in a species?

After recovering refrigerant from a sealed system if nitrogen is used to pressurize or blow debris out of the system the nitrogen:

What is a solution? A. A solute layered on solvent. B. A solute dissolved in solvent. C. A solvent layered on a solute. D. A solvent dissolved in a solute.

How long does it take decaying organisms to transform into fossil fuels?

In your own opinion what do you think is the meaning of Natural Resources? and is it important in the development of a city or a country?

What type of radiation exposure of 100,000 mrem can cause radiation sickness or increase the risk of cancer? Long term exposure Short term exposure Both long and short term exposure

Why does it hurt your hands when you carry heavy shopping in carrier bags?

Why did scientists choose carbon as a base for the atomic mass unit? Which isotope of carbon did they use?

What organelle is found in all animal cells and some plant cells

Basic of Archimedes's principle of how fluid can make body to float and sink.

A bullet is accelerated down the barrel of a gun by hot gases produced in the combustion of gun powder. What is the average force (in N) exerted on a 0.0500 kg bullet to accelerate it to a speed of 625 m/s in a time of 1.10 ms (milliseconds)