School bus drivers are extra careful when they cross railroad tracks. They stop before they cross railroad tracks to be sure that there is no train coming. Yet, trains typically move more slowly through towns than cars do. If trains usually move more slowly than cars, why can they do more damage if they hit something in their path?

because trains are bigger and heavier than cars.

Explanation:

The question is incomplete. Here is the complete question

Read the excerpt from "Bone Detective," by Lorraine Jean Hopping.

Diane stood in front of a mirror and stuck out her tongue. It looked like a rosy pink welcome mat to her delicate insides. Her usual rubber mold formula was out of the question—too toxic. She wondered, What is safe to swallow, fast and easy to apply, and hardens quickly into a firm mold?

One of her horse-riding pals, a veterinarian named Mary Wright, had the alginate. Mary told Diane that alginate was a pink gummy material used to make molds of teeth. If it was safe for pets, it should be safe for a tiger.

And people, too, Diane thought.

Based on the details in this excerpt, the author would most agree that Diane France is

generous and friendly.

cautious and fearful.

unwise and hasty.

curious and resourceful.

Cautious and fearful

Explanation:

According to the excerpt gotten from the book "Bone detective" Diane is very worried about the state of her teeth. She needs a new mold formular for her teeth as the previous one that she uses is very toxic and no longer suitable to her.

Diane needs a new mold formular that would be easy to apply, be able to solidify within a short period of time and safe for her body.

A close friend of hers Mary Wright suggested a new mold formular to her. Mary is a veterinarian who specializes in treating animals. Mary told her that the alignate formular has been successfully used for her pets.

Diane is scared on what formular to use as she needs to be very careful in choosing the right one that will not cause more harm to her teeth.