Question

how have changes in seatbelts kept people safer? fill in the blanks to explain.
at first, seatbelts went across the
lap
only. then
seatbelts were
lower - body
, every seat
have this kind of
three - point

shoulders and the waist, as well as the lower body. this
design worked much better.

seatbelts in cars today keep riders even safer.

by 1975, a law required that three - point seatbelts be put
in the front seat of all new cars. after more studies,
another law passed in 1980, and the belts were required in
the back seat, too. these are the type of seatbelts you see
in cars today

Explanation:

The text describes the evolution of seatbelts. Initially, seatbelts were lap - only. Then three - point seatbelts were introduced. Three - point seatbelts secure the shoulders, waist, and lower body, providing better safety.

Answer:

At first, seatbelts went across the lap only. Then three - point seatbelts were introduced. Three - point seatbelts secure the shoulders, waist, and lower body, providing better safety.