4 Question 23 (1 point)
7
In a lab experiment, a student wants to test the amount of dissolved oxygen
produced by algae. Dissolved oxygen refers to microscopic bubbles of
gaseous oxygen (02) that are mixed in water. The student's experimental design is
described below:
Flask A: Contains photosynthetic green algae and 1 hermit crab
Flask B: Contains photosynthetic green algae and O hermit crabs
Both flasks are placed under a light bank. The lights are set to cycle between 12
hours of dark and 12 hours of light. The dissolved oxygen concentrations in both
flasks are recorded daily. A diagram of the experimental set-up is shown below:

Which medullary index indicates a human hair? a. 0.653 b. 0.733 c. 0.516 d. 0.256

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

The large increase in atmospheric carbon dioxide in the last 50 years most likely comes from a. an increase in cellular respiration b. increased decomposition by bacteria c. an increase in the burning of fossil fuels d. an increase in photosynthesis