Which of the following scenarios represents change to an ecosystem bu which of the following scenarios represents change to an ecosystem brought about by biotic factors
a. a wildfire cause by lighting striking a tree. b.a flood caused by a severe storm. c. a land line d. a volcanos

Which of these resources is used worldwide to make construction products, pottery, and porcelain

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.

Draw a simple labelled diagram if a collenchyma tissue