Rainforests, old growth forests, and coral reefs are examples of biological __________
Fill in the blank(s) with the appropriate word(s).
ANS: hotspots
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If the rate of photosynthesis stops increasing, at what concentration of CO2 does it stop increasing?
a. between 100 and 300 ppm b. between 300 and 500 ppm c. between 500 and 700 ppm d. between 700 and 900 ppm
Several scientific laboratories across the globe are involved in research concerning the origin of life on Earth
Which of these questions is currently the most problematic and would have the greatest impact on our understanding if we were able to answer it? A) How can amino acids, simple sugars, and nucleotides be synthesized abiotically? B) How did RNA sequences come to carry the code for amino acid sequences? C) How could polymers involving lipids and/or proteins form membranes in aqueous environments? D) How can RNA molecules act as templates for the synthesis of complementary RNA molecules?
Muscles, including the biceps muscle in the human arm, are organs. What can be inferred from this information?
a) muscle contains different types of specialized cells and tissues b) muscle contains only specialized muscle cells c) muscle is a part of each of the body's organ systems d) muscle contains unspecialized cells that form a tissue
Consciousness is best associated with the
Select one: a. whole brain. b. frontal lobe only. c. cerebrum. d. whole central nervous system. e. cerebellum.