In many cases, secondary consumers cannot digest the bones of their prey. What conclusion can you draw from that ?

The conclusion to be drawn from the fact that secondary consumers do not digest the bones of their prey is that energy used to create bone mass often does not  travel farther up the food chain .

Explanation:

Options for this question are:

Although some animals can consume small bones and obtain calcium from them, their digestion is very difficult because bones are hard organic matter with little energy value.

Bones are solid structures, composed mostly of calcium. The inside of some bones, the bone marrow, is spongy and contains some nutrients. But there is a big difference between digesting bones from poultry and bones from cattle.

In one way or another, the energy used for bone formation is not transferred to predators, because in many cases it is difficult for them to digest it all.

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the correct answer, according to e2020, is the second choice there is an occluded front in region a and a cold front in region b.