Which gas passes into the blood from the alveoli? And which gas passes out of the blood into the alveoli? Please help me

Hey me with this one❤☺❤ how do you say that a cell also has a life span and death like an organism? give one example.

Fan egg cell containing the (n+1) number of chromosomes combines with a sperm cell containing the (n) number of chromosomes, what is the result of this union? a) all future somatic cells of the organism will contain the (2n + 1) number of chromosomes. b) all future somatic cells of the organism will contain the (2n - 1) number of chromosomes. c) only certain somatic cells of the organism will contain the (2n + 1) number of chromosomes. d) all future somatic cells of the organism will contain the normal diploid number of chromosomes.

Study the diagram of a cell. which structure is found only in plant cells and functions in the process of photosynthesis? w x y z