They might contain index fossils..
I'm almost certain that the answer would be X and Y
Hoped this helped!
The answer could be (spread), but there isn't much to go on here
nonliving the heat from the hot plate is causing the gel like substance to move it's the same thing with liquid nitrogen how it seems to bounce off the floor it's because liquid nitrogen is super cold and the heat basically excites the electrons in the liquid nitrogen making it bounce off the floor same with the gel like substance the electrons in the gel substance are getting excited by the heat and jumping up and down but the substance itself is not alive
Answer:
1 Zinc, 2, Hydrogen, 2 Chlorine
Explanation:
