Which cell structure is responsible for controlling what enters the cell? select one:
a. cytoplasm
b. nuclear membrane
c. plasma (cell) membrane
d. endoplasmic reticulum

According to theories of how life began, how did early organic molecules begin to separate from the outside world? a: specialized enzymes were required b: chains of amino acids created a barrier c: formation of microspheres or vesicles d: rna catalyzed the formation of membranes