There was only one mouldy apple at the bottom of the barrel!
It's a bit coarse. But unless it's mouldy it's perfectly safe.
No because now part of the apple is missing so the mass would be less. The total mass of the apple is not changed, but part of the mass is now in the biter's mouth.
The mouldy peach went mouldy and disintegrated in the bottom of Liam Booth's bag.
The total mass of the apple remains the same whether it is whole or sliced into pieces. Slicing the apple into pieces does not change the total amount of matter in the apple.
These values are similar.
The apple has mass. The Earth has mass. The apple falls down, and the Earth "falls" up. The Earth's motion is not measurable. The apple's motion is.
The approximate mass of an oxygen atom in atomic mass units is 16. Oxygen has an atomic number of 8, which means that its atomic mass is approximately 16 atomic mass units.
It is probable an error: the electron has a mass equal with 1/1836 from the mass of proton or neutron.
The approximate mass of a standard-sized paper clip is about 1 gram.
The approximate mass of an atom that contains 10 protons and 11 neutrons is 21.
"Pound" is a unit of force. It's not a unit of mass. The mass of an apple depends on the individual apple. If it weighs, say, 8 ounces on Earth, then its mass is 0.5 poundmass, or 0.015625 slug.