Explanation:
As we know cows are dependent on plants so plants are the producers and cow which consume the produced food are known as consumers.
Plant--->Cow---->Lion----->Fungus (food chain)
Plant:- producer
Cow:-primary consumer
Lion:- secondary consumer
Fungus :- decomposers
D - an increase in tree cover in the tundra.
Answer:
I believe a layer deep underground would have older things, because the ground could erode over time causing the fossil to sink into the ground.