Biology - Tagged Questions

• Where urea is formed in our body?
• In plant anatomy how do meristematic tissues fundamentally differ from permanent tissues in terms of their cell structure function and capacity for division? I need a clear comparison for my biology exam.
• In biology classes RNA and DNA are mentioned together so often that it gets confusing to separate their roles. What are the key differences between RNA and DNA in structure function and how they work inside living cells?
• In cell culture labs why is Fetal Bovine Serum (FBS) such a common and crucial additive to growth media? What specific nutrients or factors does it provide that cells can't synthesize on their own?
• I came across the name Paul Ehrlich in a biology discussion and want a clearer understanding of his significance. Based on his work and contributions how could Paul Ehrlich reasonably be described in scientific and historical terms?
• Are there specific behaviors or environmental triggers that help naturally stimulate oxytocin production in men? I'm interested in the biological basis of bonding and trust.