How do the evolutionary developments of the trilobites represent stability over the long term, and change over the short term? This is the paragraph-
Coevolution in the Fossil Record
Following the Cambrian–Ordovician extinction event, life became dramatically different. During the Ordovician, marine ecosystems expanded in a uniform climate, and high sea levels produced shallow seas all over Earth. These conditions favored Paleozoic marine invertebrates. Ecological diversity was expanded by the evolution of large predators. This evolution affected trilobites, which developed spines and other features that allowed them to avoid predation. This is an example of coevolution.

On a recent expedition to a remote region of northern canada, scientists uncovered skeletal remains from about 100,000 years ago. surprisingly, all the skeletal remains, which included many species from differing biological families and spanned about two thousand years, showed evidence of experiencing temperatures in excess of 1000 degrees fahrenheit (or 538 degrees celsius). which of the following, if true, best explains the apparent paradox between the cold environment and the evidence of the bones experiencing hot temperatures? (a) chemical changes that naturally occur during the process of decay in only one north canadian species produce the same evidence of the species' skeletons being exposed to hot temperatures as the expedition scientists found. (b) a little over 103,000 years ago, a large fire is known to have occurred in northern canada. (c) strong evidence exists that as early as 70,000 years ago, homo sapiens around the world relied heavily on fire to cook animals. (d) in the same expedition and in roughly the same layer of excavation, scientists found rudimentary wood cutting and hunting tools used by early humans.

Which statement describes john tuzo wilson’s contribution to the theory of plate tectonics?

What best describes emerging scientific ideas