“some types of vaccines need only one shot to protect you for the rest of your life. other types, such as the one for seasonal flu, change from year to year and need to be given annually.”

what does the word annually mean?

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.

b is the correct answer

mark me brainliest and hope this

they it depends on if one believes about radioactivity, they make a geiger counter beep but maybe it was going to beep anyway electronics do wierd things all the time or it was programmed to beep near certain metals.

it is the most commonly accepted one