I don't know much about it but i think it is when <span>When you crosses 2 plants of the same pure lines parentage, the resulting F1 is termed as true-breeding plants.
</span>True-breeding plants can also be produced by <span> selfing </span> (or self crossing) flowers form a pure line plant. When seeds from this fertilization are planted, they will give rise to homologous-homogeneous population.
HOPE I HELPED U ^﹏^
Basically ionic bonds can be formed between a metal atom and something called a radical ion. The radical ion could have covalent bonds within themselves, for example, CO3- is a radical ion.
Evolution, and the survival of the fittest the weak ones die off and the strong ones live and continue to reproduce
Expendable can mean having little to no value when compared to the big picture or something that's designed to only be used once and then destroyed. Since I don't have any context, I can't decipher which one it would be.
