Present perfect and past simple pls help

2. made

3. saw

4. discovered

5. exploded

6. came

Explanation:

These events happened in the past so all you had to do was change them all to past tense.

daylight saving time (dst) has been used for more than 100 years. changing the clocks does not create extra daylight, but it causes the sun to rise and set at a one of the aims of dst is to make sure that people's active hours coincide with a german analysis of 44 studies on energy use and dst found a positive

lab rats that ate more artifical sweeter gained more weight than those who ate sugar and they had “lower levels of a hormone called glp-1, which affects how full we feel.”