Which statement is true about obligate anaerobes? view available hint(s) which statement is true about obligate anaerobes? they obtain energy by oxidizing ferrous ions. they will use o2 if it is present, but may obtain energy by fermentation if needed. they use o2 for cellular respiration and cannot grow without it. they are poisoned by o2. they live exclusively by cellular respiration or by anaerobic respiration.

Which of these is not an example of chemical weathering? a. iron-rich mineral rusting b. feldspar turning into clay c. limestone reacting with acid d. granite breaking up into sand

Answer the questions about this reaction: nai(aq) + cl2(g) → nacl(aq) + i2(g) write the oxidation and reduction half-reactions: oxidation half-reaction: reduction half-reaction: based on the table of relative strengths of oxidizing and reducing agents (b-18), would these reactants form these products? write the balanced equation: answer options: a. 0/na -> +1/na+1e- b. nai(aq) + cl2(g) → nacl(aq) + i2(g) c. +1/na+1e- -> 0 /na d. -1/2i -> 0/i2+2e- e. no f. 4nai(aq) + cl2(g) → 4nacl(aq) + i2(g) g. 2nai(aq) + cl2(g) → 2nacl(aq) + i2(g) h. 4nai(aq) + 2cl2(g) → 4nacl(aq) + 2i2(g) i. nai(aq) + cl2(g) → nacl(aq) + i2(g) j. 0/cl2+2e -> -1/2cl- k. yes

Quickly what are the following of organisms that existed over a wide area but only for a limited time period called a. soft fossils b. mold fossils c. index fossils d. trace fossils