What is the following that serves as a passage way for food and air

What is the main causes of gray hairs and balding? write your answer in 2 paragraphs

True or false a fertilized cell divides many times to form an embryo

Which of the following statements describes the lysogenic cycle of lambda (λ) phage? a) after infection, the viral genes immediately turn the host cell into a lambda-producing factory, and the host cell then lyses. b) most of the prophage genes are activated by the product of a particular prophage gene. c) the phage genome replicates along with the host genome. d) the phage dna is copied and exits the cell as a phage.