Based on their number of valence electrons, which group of elements will gain two electrons by bonding with other atoms?

a. o, s, se, te, po

b. be, mg, ca, sr, ba

c. n, p, as, sb, bi

d. f, cl, br, i, at

well first you need the sample of the temperature and gas level. i couldnt write a hypothesis unless i had some data. i think temperature changes will effect volumes of gas because gas changed into a solid or liquid at specific temperatures.

d. cellulose and starch

they have identical fossils of organisms that have evolved over time.

both have animal fossils preserved in them due to weathering and erosion.

they contain different fossils because life on earth has changed through time.

the fossils in them were formed on the surface of earth due to exposure to sunlight.