You are taking notes in a lecture, writing as fast as you can, when suddenly your hand become so stiff that you can't write any more! you pull the pencil from between your frozen fingers with your other hand, and after a few worried moments your hand is able to relax again. what happened?

Joe is breeding cockroaches in his dorm room. he finds that the average wing length in his population of cockroaches is 4 cm. he chooses the six cockroaches that have the largest wings; the average wing length among these selected cockroaches is 10 cm. joe interbreeds these selected cockroaches. from earlier studies, he knows that the narrow-sense heritability for wing length in his population of cockroaches is 0.6. a. calculate the selection differential and expected response to selection for wing length in these cockroaches. b. what should be the average wing length of the progeny of the selected cockroaches?

Identify the various levels of atmosphere. troposphere mesosphere exosphere stratosphere thermosphere

The breakdown of food is accomplished by enzymes. a. physical b. chemical c. mechanical d. none of the above