They are composed of proteins. I cannot see the options but hopefully that answer is in one of them
I just looked it up, it's carbon!
Answer:
3 - Photoreceptors.
Explanation:
Photoreceptors are a sensor that is connected to your retina. They sense light and send the message to your brain. The sensors automatically squint your eyes if something will blind you.
The correct answer is 'photoreceptors'.
Volume the volume of the test tube is approximately 35cm so the water is 20m/cw idk if this helps
Nucleic acid because it is genetic material