What are the respiration organs of the following fishes mamals insect lizzard

Gabriel is at a stage where his body is changing physically; he is growing facial hair and building muscle. he is also just starting to make sperm. what is most likely gabriel’s age? 5 12 17 21

Why aren't the stains like crystal violet and safranin washed away with water during simple staining?

What is the role of the phospholipid belayer in cellular transport in living cells