How did the analysis of fundamental similarities and differences in nucleic acids give rise to three main kinds of living things? How do these domains differ?
?Fundamental similarities and differences in nucleic acids have given rise to three main kinds of living organisms: Bacteria, Archaea, and Eukarya, called domains. Bacteria and Archaea are both domains of very small single-celled organisms that lack distinct compartments within their cells. They have some important chemical and genetic differences, however, and the walls surrounding their cells are structurally different. The Bacteria have evolved diverse metabolic abilities-some are photosynthetic, others heterotrophic-and are familiar to use as decomposers and disease agents. Some Archaeans are called extremophiles because of their ability to withstand extremely hot or corrosive environments.
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What is not a characteristic of western boundary currents?
a. They move warm water poleward. b. They are fast moving currents. c. They are deep currents. d. They are broad currents.
Most ecological efficiencies in natural ecosystems average about ________ percent
A) 2 B) 6 C) 10 D) 15 E) 20
Research into in situ (underground) coal gasification is in progress, but there is concern about subsidence over the gasified coal beds.
Answer the following statement true (T) or false (F)
Mass extinctions at the end of the Ordovician occurred because of
a. dramatic changes related to glaciation. b. dramatic chemical changes in seawater related to meteorite impact. c. increased solar radiation. d. decreased solar radiation. e. none of the above