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In a healthy person, the feces leaving the body contain very few undigested molecules from food. One major exception is cellulose, which leaves the body virtually intact. From this we can conclude that the human digestive system does not

(A) digest cellulose because it does not contain any energy
(B) produce enzymes that can break down cellulose
(C) have a large intestine long enough to break down cellulose
(D) contain enzymes that can digest proteins such as cellulose

The collared lizard is a species found in the desert southwest. male collared lizards show considerable color variation, ranging from brightly colored to a very dull pattern. your goal is to determine the function, if any, of male color patterns in collared lizards, using the scientific method. your tentative explanation is that male color plays a role in attracting females for mating purposes. you predict that females will preferentially choose brightly colored males over dull-colored ones. to test this prediction, you observed the interactions of female collared lizards with their male counterparts. you selected males that were the same age and size, and that differed only in their coloration pattern. you placed equal numbers of the two types of male lizards, bright and dull, in aquariums, along with one female lizard per aquarium. out of 350 aquariums observed, the female chose to mate with the brightly colored male 277 times, and the dull-colored male 70 times. in 3 instances, the females did not mate with either type. create a bar graph of your data, plotting the type of male (dull or brightly colored) on the x-axis. on the y-axis, plot the frequency with which each type of male was chosen by females. using this graph, answer the following question(s). is it reasonable to conclude (i.e., is it supported by the data) that female collared lizards prefer more brightly colored male lizards over dull-colored males?

As a small change in a person's dna can cause a genetic disorder

Why are scientists concerned about the depletion of the ozone levels in the stratosphere?