Which of Earth's layers is the thinnest? OA.
outer core
ОВ.
crust
OC.
mantle
OD.
inner core

What are the student's observations and inferences before he starts his investigation?

The diagram shows a chicken embryo and a human embryo

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.