I need Help with the Lines..

1. what are some of the challenges in determining the time of death using insects? type your response here in paragraph form (at least 5-7 sentences):

Which of the following statements is most likely correct about a rock belonging to the jurassic age and a rock belonging to the cambrian age? options: 1) they have identical fossils of organisms that have evolved over time. 2) both have animal fossils preserved in them due to weathering and erosion. 3) they contain different fossils because life on earth has changed through time. 4) the fossils in them were formed on the surface of earth due to exposure to sunlight.

The direct energy source that drives atp synthesis during respiratory oxidative phosphorylation is