Didn't mean to post this. sorry!
Yes it is people are a biotic factor
The correct answer is C
the photoreceptor is represented by the rods and cones, the receptor neurone is the bipolar neurone in the retina, in the brain the multipolar neuron in the retina synapses with a neuron in the geniculate nucleus that sends impulses through the third cranial nerve
Light energy is captured by plants;light energy is converted to chemical energy
The purines have two rings in their structure while the pyrimidines have hust one