Watch: Exploring Ecosystems: Coastal Food Webs | California Academy of Sciences (4 min.) Write down your response to each of these questions:

1. Do you think it is important for ecologists to understand the relationships within an ecosystem and to monitor (visit and track the populations of organisms) regularly?

2. Do you find the relationships in food webs interesting? Explain why or why not.

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.

When listening the levels of orginization in orginisims from the smallest to most complex , which level is just below organs in complexity

Which of the following types of stars are dim but can have high surface temperatures? giants main sequence stars supergiants dwarfs