On the nature trail at pennsylvania state university, tall pine trees have reduced the amount of sunlight that reaches the forest floor. while hardwood trees flourish in shaded regions, pine seedlings require sunlight. ecologists believe that over time, the hardwood trees will replace the pine trees. this scenario is an example of which concept? a. competition b. succession c. natural selection d. cross pollination
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Biology, 22.06.2019 03:50
2. how does the miller-urey experiment fall short of demonstrating that life can arise from inorganic molecules? explain. a. it doesn't show a leap between a collection of amino acids and a single-celled organism. b. it recreates the conditions that existed at the earth's beginning, but no molecules form as a result. c. it doesn't provide evidence of the formation of amino acids. d. it doesn't show how multicellular organisms developed from unicellular organisms
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Biology, 22.06.2019 10:00
Veins have a much lower blood pressure than arteries. which of these prevents backflow of blood in veins? a. pressure applied by the heart b. one–way valves in veins c. thin muscular walls of veins
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Biology, 22.06.2019 11:30
According to theories of how life began, how did early organic molecules begin to separate from the outside world? a: specialized enzymes were required b: chains of amino acids created a barrier c: formation of microspheres or vesicles d: rna catalyzed the formation of membranes
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Biology, 22.06.2019 14:40
Explain the causes and effect of damage to the genetic code.
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On the nature trail at pennsylvania state university, tall pine trees have reduced the amount of sun...
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