Can someone help me plz ill give brainliest

exercise 1. :

exercise 2. :

the magnetic pins are - pin A and pin C

( because only magnets or magnetised materials can repel each other...)

i hope it helped. ...

co2reflects heat radiation back to earth buning coal and oil emits co2 globe warms

the earths atmosphere is made up of nitrogen and oxygen. solids can turn into gasses through a process called sublimation. sublimation is the transition of a substance directly from the solid to the gas phase, without passing through the intermediate liquid phase.

hope this : d