Question 10 of 40 50 50 points on the ph scale

This preview shows page 7 - 14 out of 30 pages.

Question 10 of 40 5.0/ 5.0 Points On the pH scale ranging from 1 to 14, 7 is neutral. Any number greater than 7 is alkaline; any number lower than 7 is acidic. With that in mind, in turns out that the oceans are serving as a carbon sink. About __________ percent of current carbon dioxide emissions have been absorbed into the oceans. A. 30
B. 40 C. 50 D. 60 Question 11 of 40 5.0/ 5.0 Points __________ is both our planet’s thermostat and the world’s chief greenhouse gas.
Question 12 of 40 5.0/ 5.0 Points The actual location of some natural space inhabited by particular flora and fauna is called a/an:
Question 13 of 40 5.0/ 5.0 Points Of the four modes of species interaction, trophic interactions are associated with:
B. competition. C. mutualism. D. predation. Question 14 of 40 5.0/ 5.0 Points Which of these atmospheric layers enables radio transmissions? A. Troposphere B. Stratosphere C. Ionosphere
D. Thermosphere Question 15 of 40 5.0/ 5.0 Points Which of the following is a biotic as opposed to an abiotic factor in an ecological system?
Question 16 of 40 5.0/ 5.0 Points Ecologists who study the way many species interact with each other in a specified area are focused on:
Question 17 of 40 5.0/ 5.0 Points Extinctions are not rare. Over an extended period of time, based for example on fossil evidence, a certain number of species will become extinct each year. Thus, experts can estimate a background rate of species extinction. Using that estimate, researchers can compare it to the current extinction rate over, for example, the last two decades. What they have found is startling. According to cautious estimates, the current extinction rate is __________ times greater than the background rate.
B. 50 C. 100 D. 300

  • Left Quote Icon

    Student Picture

  • Left Quote Icon

    Student Picture

  • Left Quote Icon

    Student Picture