Answer:
When the population reaches its carrying capacity.
Explanation:
As a population grows, there is more competition for resources which can limit a population. There are also natural disasters that can play a role too such as disease. Another factor that is part of carrying capacity is the size of the habitat. If there is no room, then the population cannot increase.
The answer that fits the blank is RED. The phytochrome refers to the pigment that are found in plants which is sensitive to light, particularly the color red of the visible spectrum. This pigment is actually blue-green in color. This pigment plays various significant roles in photo-perception among plants.
