Tall trees create shade over smaller trees, causing the smaller trees to experience changes in sunlight. which is most likely a limited resource for the smaller trees?

Light

Explanation:

Light is an important growth factor for plants generally because its energy is utilized for food production during photosynthesis.

When tall trees form a shade over smaller trees, light becomes inadequate for the smaller trees and as such, a limited resources.

Limited resources are resources that are available in an amount that is not enough for the normal functioning of organisms.

light intensity; since these plants experienced fluctuations in sunlight,  penetration, and photosynthesis can not  occur without  adequate sunlight, definitely light intensity is the major limited resources. other limited factors/resources of photosynthesis - concentration of carbon dioxide  and temperature, are still relatively available to the plants.

Consequently these plants needs to adjust the leaf positions to sunlight for maximums light intensity.They therefore spend more energy and time   to adjust leaves for low light intensity  for  maximum light absorption,  thereby reducing rates of photosynthesis and reduces carbon loss through respiration.

Thus they are thin in structure,with small mass per unit area, and large mass of chlorophyll distributed in their leaves.

Explanation:

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sodium i think the chemical element of atomic number 11, a soft silver-white reactive metal of the alkali metal group.