giúp mình vớii ạ.chọn một chu đề để xây dưng kế hoach hoat động vui chơi trong một tuần cho trẻ mầm non. cảm ơn ạ

acid rain does not usually kill trees directly. instead, it is more likely to weaken the trees by damaging their leaves, limiting the nutrients available to them, or poisoning them with toxic substances slowly released from the soil. the main atmospheric pollutants that affect trees are nitrates and sulphates.

idk what is it? is this a question that you know the answer or u dont

nuclear fission produces elements that are heavier than helium.

the elements that are used in nuclear fission and their products are much heavier than helium.