Woese:. a) was involved in determining rRNA sequences. b) proposed breaking prokayotes into Archaea and Bacteria. c) proposed breaking eukayotes into Archaea and Bacteria. d) was involved in refining the Gram stain for classification purposes. e) a and b

Explanation:

1. Carl Woese, was born in July 15, 1928 is  American microbiologist.

2. Carl Woese discovered the group of single-cell prokaryotic organisms known as archaea, which now constitute a third domain of life.

3. Worse was involved in;  i)determining rRNA sequences and also in ii)he proposed breaking prokaryotes into two groups.

4.The method Woese used, is  called ribosomal RNA.

5. He study rRNA instead of DNA because, RNA is a simpler molecule than DNA.

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explanation:

answer and explanation;

volcanic rocks are igneous rocks which form from lava, molten rock which has been thrust out of a volcano onto the surface of a rocky body such as an asteroid, planet, or dwarf planet.  

plutonic rocks are igneous rocks which form from subterranean chambers of molten rock or magma. plutonic rocks make up the base of continental crust as well as oceanic crust. their slow rate of formation causes them to be coarse grained since there is plenty of time for large crystals to form before the magma solidifies into rock.

the textural difference is that plutonic rocks are more coarse grained than volcanic rocks. plutonic rocks are coarse grained while volcanic are fine grained ; glassey or fragmental. since fine and coarse are adjectives the decision as to whether a rock is fine or coarse grained is generally made on the bases of whether or not the individual crystals can be seen in most if the rock.