Noob question about tomato sprouts

Noob question about tomato sprouts

Is it normal for the two first leaves to turn brown and fall off after the first shaped leaf starts to grow on tomato plants? I am asking, because my sprouts have started to do this..
Lilac problem

Lilac problem

New Apartment from Haifa, Israel

New Apartment from Haifa, Israel

My newly rearranged room

My newly rearranged room

Blank Slate

Blank Slate

Parakeets?

Parakeets?

tulip forming bulb above ground?

tulip forming bulb above ground?