Which of the following is not a skill scientists use to learn about the world?
a.
predicting
c.
inferring
b.
observing
d.
scientists use all of the above skills

The answer is D hope this helps

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.