If you are exercising in your target fitness zone, you are between your threshold of training and your target ceiling.
If you achieve a good fitness rating, you probably are at the level of fitness needed to live a full, healthy life.
These are what I found on Quizlet.
Answer:
(A)
Explanation:
A
Answer:The placenta begins to develop to provide food and oxygen.
I believe the thinnest layer is called the cuticle, while the thickest layer is the dermis.