Refer to the photograph of the Po Delta, Italy (Fig. 9.4). During Etruscan times around 600 BC, the city of Adria was a
busy seaport on the coastline at the mouth of the Po River. Adria was so important that the Adriatic Sea was named
after it. The Po River has continued to deposit sediment at its mouth and has extended its delta far beyond Adria,
which is no longer located on the coastline.
1. What has been the average annual rate (in cm/yr.) at which the Po Delta has extended toward the Adriatic Sea
since Adria was a thriving seaport on the coast? Show your work.
2. Based on the average annual rate that you just calculated, how many centimeters does the leading edge of the
Po Delta move seaward during the lifetime of someone who lives to be 60 years old? Show your work.
3. REFLECT & DISCUSS Sea level is rising and submerging coastlines adjacent to the Po Delta, and yet the
delta is still extending out into the Adriatic Sea. Why?

Which group of chordates does  notpossess true backbones?                 a.  birds      b.  frogs and toads      c.  lampreys      d.  crocodilians

Mike was adopted, and his biological family history is unknown. although he is healthy, he would like some understanding of his genetic makeup, including potential health risks and genes that he could pass on to his children. mike has heard about commercial laboratories that can compare segments of your dna to those of people with common hereditary diseases in order to give you some idea of how susceptible you are to the diseases. the results of these types of tests are highly inconclusive. if mike's dna showed that he shares similarities in a segment of dna with people who have a given disease, his chances of developing that disease or passing it on to his children may be slightly elevated, but they are not 100 percent. these tests can cost more than $2,500 and are not covered by many insurance companies. do you think that mike should undergo the genetic tests? explain your answer. what are the potential pros and cons of having such tests done? describe how the availability of these genetic tests might affect the frequency of genetic diseases in individuals and populations.

Astudent observes a star from two positions of earth in its orbit, in summer and winter, and measures the change in the position of the star. which of these can be best calculated by this method?