Acell is if it lacks a nucleus and membrane-bound organelles.
a.
autotrophic
b.
prokaryotic
c.
eukaryotic
d.
heterotrophic

B. prokaryotic because prokaryotic cells lack a nucleus and membrane-bound structures.

The correct answer is Option B.

Explanation:

For the given options:

Option A: Autotrophic organisms are defined as the organisms which produce  their own food for survival. For Example: Green plants

Option B: Prokaryotic organisms are a unicellcular organisms which lack a membrane bound organelles like mitochondria, nucleus etc.. For Example: Bacteria.

Option C: Eukaryotic organisms are multicellcular organisms which have membrane bound organelles like mitochondria, nucleus etc.. For Example: Human beings.

Option D: Heterotrophic organisms are defined as the organisms which do not produce their own food. For Example: Tigers, Lions etc..

Hence, the correct answer is Option B.

the minimum amperage that the current in this wire would have to have so that its weight is completely supported by the magnetic force due to earth's field, assuming that no other forces except gravity act on it