Explain how energy flows through an ecosystem. Be sure to address the following items for 2 points each:

1. What is the original source for all energy in an ecosystem

2. Discuss how the energy is capture and used by at least three trophic levels

3. Discuss how effective the flow of energy is as it moves through trophic levels​

Some birds look for food near cattle and other livestock. the movement of the cattle churns up the ground, making insects available to the birds. the cattle appear to be unaffected by the presence of the birds. what kind of relationship exists between the birds and the cattle? o a. parasitism o b. commensalism o c. predation o d. mutualism

Cold case files recently began re-investigating an old murder case. the murder took place in the park; a young man, james, was hit over the head with a brick and killed. police suspected the jealous former boyfriend of james' wife, karen. whoever killed james may have washed their hands in a near-by bird bath as detectives found blood in the bird bath. since the murder took place before dna fingerprinting was available, the suspected killer, ronnie, went free. detectives are now reviewing the blood evidence using dna fingerprinting. based on the dna fingerprints of all possible suspects, who is james' killer?

In general, characteristics that an organism survive and reproduce become more common over time. what mechanism of evolution causes this?