Mutations .

are random
delete genes from the gene pool
add new genes to the gene pool
are changes in an organism's DNA
are rare occurrences

The variables for this experiment include the number of each type of sprout, the average height of those sprouts, and the amount of compost given to each plot of land. use the drop-down menus to complete the sentences and identify the independent and dependent variables. the independent variable, the one that you intentionally manipulate, is the the dependent variables, the ones that you measure the response in, are

8) animals respond in various ways to stimuli detected through their senses. some of these responses are stimulated by the presence of danger. which of these animal responses is the best example of a response to an immediate threat? a) a rooster crows every morning at the first sign of light. b) as something approaches an octopus, it shoots a cloud of ink. c) from late fall until spring, bears hibernate to preserve energy. d) a dog is getting hot in the sunlight, so he moves to a shaded area.

Why do some dna fragments move farther than others during gel electrophoresis? a. because their shapes are different b. because they are different types of molecules c. because the samples are different colors d. because their masses are different