How did a change from the normal red blood cell shape most likely originate?

Chicken pox and hepatitis are bacterial diseases. true or false?

Ascience research group is testing a new type of plant food. one trial is conducted in a controlled experiment. the data from the trial show that the plant that received the new food grew faster than the control plant. the group announces that the new plant food makes plants grow faster. what is the main weakness in this scientific claim?

Which of these is one of the nitrogenous bases in dna? a. proline b. leucine c. glycine d. thymine