Answer:
A. Atmosphere
Explanation:
Atmosphere would be most immediately affected by a decrease in sunlight because sunlight is responsible for the photosynthesis in plants. if sunlight decreases, the photosynthesis reaction is also decreases in plants and less carbondioxide gas is used by the plant from atmosphere for making their food so we can say that atmosphere is greatly affected by the decrease in sunlight.
The Cell membrane-bound organelles, which carry out cell functions.
Nucleus, which contains the DNA cytoplasm.
The nucleus, the membrane-enclosed internal region that contains genetic material.
Overtime the ecosystem will start to decline...animals will start to die due to not having homes and the oxygen level in the environment will decline. It will be harder to live there and the sustainability will be low