Discuss the difficulties of applying the concept of species to a fossil organism. What will be an ideal response?


A species is a population of similar individuals that in nature interbreed and produce fertile
offspring. However, it is often unclear whether all members of a similar group of fossils were
able to interbreed. Hence, for fossil organisms, morphology has often been used to define
species.

Environmental & Atmospheric Sciences

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__________ a rebel faction, backed by Saudi Arabia and Pakistan gained control over most of Afghanistan by 1996

Fill in the blank(s) with correct word

Environmental & Atmospheric Sciences

On this map, identify the letter that is over a midocean ridge.



A) A
B) B
C) C
D) D
E) Feature is not labeled.

Environmental & Atmospheric Sciences

Which of the following statements about the fifty-year flood is true?

a. The fifty-year flood has a 50% chance of happening in a given year. b. The fifty-year flood has a one-in-fifty chance of happening in any given year. c. Once a fifty-year flood occurs, the region is safe for 49 years from another fifty-year flood. d. The fifty-year flood occurs once every fifty years. e. The fifty-year flood cannot happen twice in the same year.

Environmental & Atmospheric Sciences

Where will you find the greatest concentration of different species?

A. the poles B. Europe  C. the tropics D. Siberia

Environmental & Atmospheric Sciences