HELP THIS IS 100 POINTS In a scientific experiment, the one variable that is purposely changed to
test a hypothesis is called the:

How are mutations continually being generated in a population (what are some of the causes of mutatuions? ) explain

Which phrase is the best summary of the model shown? a. the transfer of the sun's energy through trophic levels b. a series of aerobic and anaerobic reactions c. a transformation of light energy into chemical energy d. the breakdown of food molecules

Astudent is looking through a microscope at some cells of an onion root tip. many of these cells are undergoing division since the root tip grows quickly and requires more cells. which cell most recently underwent metaphase? w x y z