What does stage 4 show? A. A young female cone with fertilized eggs matures into a seed cone. B. Young male cones produce spores using meiosis. C. A spore divides and grows into a pollen grain using mitosis. D. A seed that contains an embryo plant grows into a young pine tree.​

enzyme active site and substrate specificity

enzymes bind with chemical reactants called substrates. there may be one or more substrates for each type of enzyme, depending on the particular chemical reaction. in some reactions, a single-reactant substrate is broken down into multiple products

a scenario where a cell may be needed to perform a form of endocytosis is when transporting large molecules. a scenario where a cell may be needed to perform a form of exocytosis is when releasing the large molecule from the cell.