Acertain widely distributed mammalian species remained unchanged for about 30 million years. most members of this species lived on a fertile plain, but some members (that were less well adapted) survived in low numbers in the surrounding mountains. they adapted and evolved to this area and became significantly different from their relatives on the plain. a sudden meteorite attack struck the plain and destroyed the plain population. the mountain population was unaffected and as the plain environment recovered moved to the plain. in the absence of competitors, they underwent a very rapid population explosion. which mode of evolution does this example explain?
a. gradualism
b. punctuated equilibrium
c. microevolution

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.

During the winter, this species of fox has white fur, but in the summer, it has brown fur. what environmental change may have lead to this fox's fur color? snow cover increase in sun's brightness volcanic eruption global warming

Idon’t know the answer and i’ve been stuck on it for a while now skskskskks