Several fish species became extinct millions of years ago. The graphs
provided below show the distribution of fossils of these fishes as they
occur in several undisturbed layers of sedimentary rock observable in a
cliff face. Respond to ALL 4 PARTS below: Explain why the distribution of
the fossils in figure 1 support the hypothesis that the extinction of these
species was a result of a sudden environmental change. Describe an
environmental change that could have produced this kind of fossil
distribution. Explain why the distribution of the fossils in figure 2 supports
the hypothesis that the extinction of these species was a result of a
gradual environmental change. Describe an environmental change that
could produce this kind of fossil distribution.

There is a theory that indicates that dinosaurs became extinct when about 65 million years ago, a large asteroid hit the earth surface. dust caused by this collision blocked the sunlight reaching the earth's surface and many forms of life became extinct due to the cold. fearing this threat, how large the radius of an asteroid should you be looking for if the dangerous asteroid size is approximately the same as the one that killed the dinosaurs? available data suggests that about 18% of that asteroid's mass ended up as a dust spread evenly over earth after eventually settling out of the upper atmosphere. about 0.0180 g/cm^2 of dust, which is chemically different than the earth's rock, covered the earth's surface. typical asteroids have a density of about 1.9 g/cm^3. now that we know the size of the asteroid, how much energy was released during impact, assuming all of it was just the kinetic energy of the asteroid right before the impact?

An object moves from the position +34m to the position -15m in 15 seconds. what is it's total displacement? what is it's average velocity?

With i really need the correct answer!