diff --git a/Grade 9/Science/SNC1DZ/Unit_3_Biology_Study_Sheet.md b/Grade 9/Science/SNC1DZ/Unit_3_Biology_Study_Sheet.md
index f460f39..3a705d1 100644
--- a/Grade 9/Science/SNC1DZ/Unit_3_Biology_Study_Sheet.md	
+++ b/Grade 9/Science/SNC1DZ/Unit_3_Biology_Study_Sheet.md	
@@ -106,10 +106,13 @@
 
 ### Photosynthesis
 - Plants use the sun to make energy in the form of glucose or sugar.
-- Animals cannot make their own food (glucose, energy)
+- Animals cannot make their own food (glucose, energy).
     - Must get our food from plants.
-- Plants are the first step in the food chain
-- Oxygen released during photosynthesis is necessary for all living things
+- Plants are the first step in the food chain.
+- Oxygen released during photosynthesis is necessary for all living things.
+- 6CO<sup>2</sup> + 6H<sup>2</sup>O = C<sup>6</sup>H<sup>12</sup>O<sup>6</sup> + 6<sup>O<sup>2</sup>
+- Carbon Dioxide + Water & Light energy =  Sugar + Oxygen. 
+- The energy are stored in the plants stems, leaves, roots and seeds.
 
 ### Cellular Respiration
 - Process of converting sugar into carbon dioxide, water and energy
@@ -435,7 +438,7 @@ efficiency varies from `5%` to `20%` energy available between successive trophic
 
 ## Introducing Ecosystems
 - Most ecosystems are **SUSTAINABLE**.
-
+- Usually, a bigger food web/food chains are more sustainable, as its more resilent to change.
 <table class="table">
 <tr>
 <th>Ecosystem</th><th>Key abiotic factors</th><th>Human action and result</th>
@@ -464,7 +467,6 @@ efficiency varies from `5%` to `20%` energy available between successive trophic
 - The natural ecosystem is more sustainable, as there is a abudance of biodiversity, unlike argoecosystem which are usually monocultured. Which is unsustainble.
 - We need both of these ecosystems, as we are in need of very fast supply of certain foods due to the vast demand of it.
 - Leaching happens in agroecosystems, where nitrogen rich water from fertilizers seep into the soil. This causes nutrients to dissolve in water and seep out of the soil. Increase growth of algae, (think eurotrophication).
-- 
 
 ### Ecosystem Services/Products
 - **Cultural Services**