The difference between the rate of carbon uptake in photosynthesis and the rate of carbon loss due to autotrophic and heterotrophic respiration is the net ________ productivity
Fill in the blank(s) with correct word
ecosystem
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Which of the following vectors transmit scrub typhus?
a. Lice b. Ticks c. Fleas d. Chiggers
Conifers are particularly common in mountain and high-latitude forests. What key characteristics of conifers give them an advantage over other plant phyla in these biomes?
_____ production of resin. _____ the conical shape of the tree. _____ leaves with a relatively large surface area. _____ flexible branches. _____ a waxy cuticle. _____ tori. _____ loss of leaves during the winter months.
Plate tectonic theory is based on
a. a thermal convection model in which cool material in the earth’s mantle rises and spreads laterally beneath the crustal plates. b. the idea that the earth’s crust is fragmented into rigid crusts that are sinking slowly beneath crustal plates. c. the idea that coacervate formation causes continents to drift apart slowly on their crustal plates. d. observations that the sea floor is slowly spreading away from oceanic ridges due to thermal convection in the mantle. e. all of these.
All of the following are true about Earth's ozone layer EXCEPT:
A. It shields Earth from most ultraviolet radiation B. It is composed of O3 C. Its thickness has remained constant over time. D. CFC molecules can destroy ozone molecules E. It is predicted that a reduction of this layer will result in an increase in human skin cancer