25. Which boundary is the weakest? A. Divergent
B. Convergent
C. Transform
D. None of the above

What type of cell is produced after fertilization occurs and the gametes combines ?

In general, characteristics that an organism survive and reproduce become more common in a population over time. what mechanism of evolution cause this change?

Lactase is essential for digesting lactose in milk. this enzyme is specific for this sugar. why? molecules and active sites vary in size; only properly sized molecules can fit.there is a precise compatibility between the active site and the lactose molecule.specificity refers to the action of the enzyme, such as hydrolysis, and relatively few molecules can be hydrolyzed.reaction-specific enzymes assume a fit by folding around the most numerous substrate molecules.