- Large canopies / trees block sunlight from reaching the ground
- Tropical rainforests contain many large trees
- Hence, sunlight is blocked by large canopies / trees in rainforests

- Sunlight is blocked by large canopies / trees in rainforests
- Forest canopies blocking sunlight decreases the availability of sunlight on the forest floor
- Hence, tropical rainforest floors are low in availability of sunlight

- A required resource being low in availability has a negative impact on the something that requires that resource
- A plant requires sunlight for photosynthesis
- Therefore, a low availability of sunlight has a negative impact on plants

- Tropical rainforest floors are low in availability of sunlight
- A low availability of sunlight has a negative impact on plants
- So, low availability of sunlight has a negative impact on plants in tropical rainforest floors

- As the size of a leaf increases , the amount of sunlight absorbed by that leaf will increase
- Larger means greater / higher / more / increase in size
- So, large leaves increase a plant's ability to absorb sunlight

- A leaf is a part of a green plant
- A leaf absorbs sunlight to perform photosynthesis
- So, a plant absorbs sunlight with its leaves to perform photosynthesis

- A plant absorbs sunlight with its leaves to perform photosynthesis
- A plant requires photosynthesis to grow / survive
- So, a plant must absorb sunlight with its leaves to survive

- A plant is a kind of living thing
- If a living thing must do something to survive, then increasing that living thing's ability to do that something has a positive impact on that living thing's survival
- So, if a plant must do something to survive, then increasing that plant's ability to do that something has a positive impact on that plant's survival

- A plant must absorb sunlight with its leaves to survive
- If a plant must do something to survive, then increasing that plant's ability to do that something has a positive impact on that plant's survival
- Hence, increasing a plant's ability to absorb sunlight with its leaves has a positive impact on that plant's survival

- Large leaves increase a plant's ability to absorb sunlight
- Increasing a plant's ability to absorb sunlight with its leaves has a positive impact on that plant's survival
- So, large leaves have a positive impact on a plant's survival by increasing that plant's ability to absorb sunlight

- Sunlight is blocked by large canopies / trees in rainforests0
- An adaptation / an ability has a positive impact on an animal 's / living thing 's survival / health / ability to reproduce
- Hence, large leaves are a kind of adaptation for absorbing sunlight

- Sunlight is blocked by large canopies / trees in rainforests1
- Low availability of sunlight has a negative impact on plants in tropical rainforest floors
- So, plants on tropical rainforest floors grow large leaves due to the low availability of sunlight

Therefore, plants on tropical rainforest floors grow large leaves due to the low availability of sunlight
Question: A tropical rain forest contains many tall trees. Smaller plants with large leaves grow at the base of the tall trees. The large leaves are most likely an adaptation of the plant due to which condition?
Context: - As the size of a leaf increases , the amount of sunlight absorbed by that leaf will increase 
- An adaptation / an ability has a positive impact on an animal 's / living thing 's survival / health / ability to reproduce 
- Large canopies / trees block sunlight from reaching the ground 
- Forest canopies blocking sunlight decreases the availability of sunlight on the forest floor 
- Larger means greater / higher / more / increase in size 
- A leaf is a part of a green plant 
- Tropical rainforests contain many large trees 
- A plant requires sunlight for photosynthesis 
- A leaf absorbs sunlight to perform photosynthesis 
- A plant is a kind of living thing 
- A required resource being low in availability has a negative impact on the something that requires that resource 
- A plant requires photosynthesis to grow / survive 
- If a living thing must do something to survive, then increasing that living thing's ability to do that something has a positive impact on that living thing's survival