What do the hair like structures called cilia allow the paramecium to do? a. hold on to it's food b. send out sonar to locate food c. hold on to other organisms d. move

Is there any species that went extinct in recent years due to natural causes (not caused by human interaction). if so, what caused it?

Why has two different alleles for the same trait?

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.