I'd say heat, more specifically sunlight.
Why?
Because sun is the form of energy needed for plants to grow and live. Plants in turn are the form of energy needed for herbivores to live that later on turn out to be the form of energy needed by the carnivores. When these die, decomposers will be the ones to take advantage of the energy.
As you can see an ecosystem has already been formed: producers, secondary consumers, tertiary consumers or decomposers.
Hope it helped,
Happy homework/ study/ exam!
I'm sorry but I need a little bit more context
The three R's- reduce reuse and recycle all help cut down on the amount of waste we throw away. they conserve natural resources, landfill space and energy, plus, the three R's save land and money communities must use to dispose of waste in landfills
Carrying Capacity. For a given region, carrying capacity is the maximum number of individuals of a given species that an area's resources can sustain indefinitely without significantly depleting or degrading those resources. Reproductive lag time may cause the population to overshoot the carrying capacity temporarily.
The correct answer is G. plants can't grow into each other, so when they are tightly packed together they will not grow as large as they would if they were spaced out.
