Question 9 of 10
5 points
why do we only have fossils of a fraction of the things that have existed on
earth?
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a. many environments are not suitable for fossil formation.
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b. fossils can only form during an ice age.
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c. fossils can only form underwater.
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d. not all mammals can become fossilized.
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Which of the following is a possible reason for sleep? a) growth b)digestive c)speed d)intelligence

Ascientist is conducting an investigation that involves water, silver, carbon dioxide, and oxygen gas which group of statements best describes all of the materials he is using in the investigation?

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.