Biology, 09.10.2019 23:00 coolfreekid3
Which of these statements is true about the oxygen revolution? . a. cyanobacteria were the first organisms to introduce oxygen into the atmosphere.. b. protocells were the first organisms to produce oxygen in water, which then escaped into the atmosphere.. c. cyanobacteria were the first organisms to produce oxygen in water, which then escaped into the atmosphere.
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Biology, 21.06.2019 16:00
Dwarf galaxies are select one: a. relatively rare. b. not very bright c. mostly spiral shaped. d. none of these.
Answers: 1
Biology, 22.06.2019 06:10
You are working in the lab and are working with the same element but with varying isotopes of the element. you are working with c-11, c-13, c-14, and c-15. what is the average atomic mass of this element? (use periodic table) a- 12 b-15 c-14 d-13
Answers: 2
Biology, 22.06.2019 15:30
The image shows a group of fish. the type of social behavior shown in the image is called
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Biology, 22.06.2019 16:30
You will create a molecular clock model for an arthropod gene. follow these guidelines to make your model: . your timeline will span from 90 million years ago to the present. the common ancestor in your model is an arthropod that lived 90 million years ago. the gene that you'll track codes for a protein in the species venom . the dna sequence youll track contains 10 nitrogen bases. you can choose the order of the bases and where the mutations occur. this gene mutates at a rate of approximately 0.76 base pairs every 17.1 million years. to build your model,/ calculate the estimated time period it takes for 1 base pair to mutate. the first time period will only show the common ancestor. at the beginning of the second time period, three lineages will diverge from the common ancestor, each with a different mutation in their gene sequences. the first and third descendant species will survive for the rest of the timeline. the second descendant species was extinct 50 million years ago. calculate how long it will take for one full base pair mutation to occur. explain your reasoning by constructing a mathematical equation
Answers: 2
Which of these statements is true about the oxygen revolution? . a. cyanobacteria were the first or...
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