A chemical is spilled in a grassy area. The chemical has been known to kill all
bacteria that live in the soil. How will this most likely affect the area?
O A. The grass will grow more quickly, because it will have more access
to nitrogen compounds.
B. The grass will grow more quickly, because there will be no bacteria
in the soil.
C. The grass will die, because it will not be able to use the nitrogen
compounds in the soil.
D. The grass will die, because the bacteria fix the oxygen for the
grass to use.

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?

1. emigration the movement of people from one place to another 2. immigration a situation in which resources are being used up at a faster rate than they can be replenished 3. migration the leaving of one's homeland to settle in a new place 4. overpopulation the movement of people to a new country 5. sustainable development a situation in which the birth rate is not sufficient to replace the existing population 6. underpopulation the ability to meet current needs without reducing the ability to meet future needs 7. unsustainable development the increase in the population of a city 8. urbanization a situation in which the number of people exceeds the available natural resources in an area

If assuming tasting ptc as a simple gene trait,what other genotype would you select to put in this missing genotype box that could result in this phenotype