Mrs hernandez is explaining how gravitational forces of the moon and the sun pull the water in earths ocean causing tides he uses a basketball to represent the sun and a golf ball to represent the moon what would be a good object to represent earth and to show the effect of gravity on it

Number and variety of living organism; includes genetic, species, and ecological types

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.

The earth formed roughly 4.5 billion years ago, yet evidence of life dates back to about 3.5 billion years ago. which one is not a possible hypothesis of how life on earth arose?