Id say family functions are never normal u did not put optionsXD next time u shuld
The correct answer is D: stable and not growing or shrinking. I hope this helped:)
No they cant be mechanical because then something would have to generate their rays through the inventing of a machine.
"Introduction of non-natives always cause great harm to the environment." Non-natives don't always cause damage and/or harm.
They might be going through the S Phase of the cell cycle which is DNA replication. Usually, when the cells go through this phase they end up to dividing.