What type of organism converts nitrogen into a usable form for plants?
a) bacteria
b) earthworms
c) fungus
d) mold

Answer : The correct option is (A) Bacteria.

Explanation :

The nitrogen is converted into ammonia with the help of nitrogen fixing bacteria which are present in association with the roots of some plants.

Ammonia can be utilized in protein formation which is used as nutrient for the plant growth.

Example of nitrogen fixing bacteria is Nostoc.

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explanation:

in scientific notation, the value of the  speed of light in a vacuum

  will be written as 2.995 * 10^8. when this value is represented in the form of

  a * 10^b, then, a = 2.995 and b = 8.

the value of the speed of light in a vacuum given above can also be rounded up to approximately 300000000. in this case, the scientific notation will be written as 3 *10^8.