How do organisms form carbon films? Organisms turn into rock.
Residue is left on rocks when organisms decay.
Hollow forms are left in sediment by decaying organisms.
Organisms leave evidence of their activities, such as footprints.

Organisms turn into rock.

Explanation:

answer : hollow forms are left in sediment by decaying organudms

explanation :

Organisms form carbon film when sediments cover the organisms and decay of organisms form hollows. EXPLANATION: When an organism is covered by sediment, it begins to decay. ... The hollow that forms on the sediment is the carbon film that contains what are called fossils of the organism.

as given the equation is

2al + 6 hcl > 2 alcl3 + 3 h2(g)

as per equation two moles of aluminum reacts with six moles of hcl to give two moles of alcl3 and three moles of hydrogen gas

given: three moles of al are present and 7 moles of hcl

for three moles of aluminum nine moles of hcl will be required

however as 7 moles of hcl are present so the limiting reagent is hcl

hcl is going to decide the number of moles of product formed

when six moles of hcl are present = 3 moles of h2 are formed

when one mole of hcl is present == 3/6 mole sof h2 will be formed

when 7 moles of hcl are present = 3 x 7/ 6 moles of h2 will be formed = 3.5 moles of h2

(b) which contains higher levels of vitamin b, oranges or spinach?

explanation:

you can eliminate a, c, and d because they are questions based on opinions.