For the first half of your question, plants do need to eat. In fact, they are autotrophs, which means they are self feeders.
The answer is Nuclear envelope.
Basically, the Nuclear envelope is an outer shell that protects the cell (which includes the dna) from any harmful things.
The answer is
B........................................
This illustrates <span>absolute threshold. The correct option among all the options that are given in the question is the second option or option "B".
</span><span>A spot in the middle of the retina that only contains cones is called the fovea. The correct option among all the options that are given in the question is the third option or option "C".</span>
