Which of the following best describes a food web?

a series of organisms that are all dependent on one other organism for food
groups of producers that are not eaten by any consumers
predators that must leave an ecosystem to hunt for food
several food chains in an ecosystem that are connected

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.