Question

cells contain a certain structure that acts as a gatekeeper in order to maintain homeostasis. this gatekeeper controls what is able to enter and exit the cell. plant cells produce oxygen as a waste product. what cell structure allows the oxygen to pass into the environment? a chloroplast b vacuole c endoplasmic reticulum d cell membrane

Explanation:

The cell membrane acts as a gate - keeper controlling what enters and exits the cell. It is also the structure through which oxygen produced by plant cells as a waste product passes into the environment. Chloroplasts are for photosynthesis, vacuoles store substances, and endoplasmic reticulum is involved in protein and lipid synthesis.

Answer:

D. cell membrane