They are known as Teratogens.
These substances are toxic and they harm the embryo. The harm may be psychological, physiological, or even both. They can come in all forms and even include simple things like alcohol which can cause the Fetal Alcohol spectrum disorder, or they can be complex things like radiation.
A substrate is a compound that binds to an enzyme and is converted to a product
examples- fats (butter), proteins (soybean), carbohydrates (potato)
Solution C is undergoing a hypotonic situation where the net movement of water is inside the cell.
Wrap your specimen in the original wrapping and give it your instruct to dispose of