2 From the thousands that sprout, why will only 1 or 2 healthy
trees grow into the available space between other existing
trees?
Small sprouts will flourish as there is plenty of space on Earth for plants
to grow
Small sprouts will compete for resources as usual, volcanic eruptions do
not effect plants
Small sprouts will never survive in the soil mixed with volcanic dust.
Small sprouts will compete for the remaining space that has adequate
sunlight

small sprouts will compete for the remaining space that has adequate sunlight

the relative atomic mass of an element is the mass of one atom of that element, relative to 1/12th of the mass of a  1212c atom. to convert to an absolute mass in kg, it is necessary to multiply by  1.661×10−271.661×10−27.

the relative atomic mass is roughly equal to the number of neutrons, plus the number of protons, in the nucleus of the atom.

for elements with more than one stable isotope (different types of nucleus with different numbers of neutrons but the same number of protons), the quoted mass is usually the average mass, weighted by the relative abundance of the different isotopes.