Apopulation of rodents, called population a, lived together in harmony on a large landmass until one group of the population dispersed to a nearby island. two million years later, the island population is split into two smaller, equal-sized populations when a river formed across the middle of the island. now two new species have evolved on the island, a1 and a2. they have replaced the population from which they were derived. which represents the phylogeny of the three extant species discussed in this scenario?

which

what is a measurement of the earth’s history divided into time periods?

> fossil record <

sedimentary rock

> geologic time scale <

radioactive elements

yes, because even though a theory has a  lot of evidence to support it, it is not always true

the circled areas are referred to   as sunspots.   the sunspots are cooler than the   surrounding area.

sunspots are temporary phenomena on the photosphere of the sun that appear visibly as dark spots compared to surrounding regions. they correspond to concentrations of magnetic field flux that inhibit convection and result in reduced surface temperature compared to the surrounding photosphere.