Answer:
Actually question says which of the following where as there is no option given.
It is basically effect of environment on expression of gene for colour.
Explanation
pH of soil could be tested where hydrangea is being grown using pH meter. Colour of plant could be noted by growing at that particular pH keeping all other conditions as constant. It has blue colour in acidic soil and pink colour in alkaline soil.
The two photosynthesis absorb the light energy though the proteins.
Walls of tissue called septums separate the left and right side of the heart. The tissue is located there to keep individual pressure in both respective sides maintained.
The answer is not A or D. I'll reread to get the correct answer!!!
