A team of scientists is studying the fossils in the cross-section of rock shown below. Between which two layer of fossils can secondary succession be observed? A) Layers 1 and 2. B) Layers 2 and 3. C) Layers 3 and 4. D) Layers 1 and 4. Eliminate

Question:

Layer 1 and 2 → Animal fossil

Layer 3 and 4 → First plant fossil

Layer 5 → Animal fossil

Layer  6→ Second plant fossil

Layer 7 → Animal fossil.

The correct option to choose answer is;

C) Layers 3 and 4 (Secondary succession layer).

Explanation:

Secondary succession is a concept related to pliant life and it describes the notion of an ecosystem regenerates after being destroyed and it takes place when the level of disruption is not enough to do away with all present vegetation and present soil from a location.

Secondary succession is started by an incident that destroys to a large extent the present ecosystem. Events that start secondary succession includes;

1) Hurricane

2) Fire and

3) Harvesting.

the awnser is group 12

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