The organelle that could b malfunctioning is the mitochondria, which packages proteins and without protein for cells, the outcome is cell lysis, or destruction.
Think about it. Caves are dark, with little to no light. If there's no light, why would you need to see? There are far more important senses than sight in cases like these. Senses such as smell, hearing, and touch.
Hope that helped.
It is definitely not a primary source: this would be a book itself.
Now, is it a tertiary source? I don't think so: the author of the review should have read the book and should only be referring to this book in the review.
I think it's a secondary source.
Pituitary gland is the endocrine gland that communicates with hypothalamus in our body growth.
Soy is a type of plant protein. This is great for vegetarians who are against eating meat but still need a source of protein. Some benefits of eating soy products (like tofu and soy milk) are mostly cardiovascular, lowering blood pressure since they are naturally cholesterol free and low in saturated fat.
