PLEASE HELP What happens when telomeres on the end of chromosomes become reduced in length?

A- The cell continues to divide indefinitely

B- The cell stops dividing until new telomeres form on the DNA.

C- The cell stops dividing and becomes senescent.

D- The cell continues to divide, but becomes senescent.

Competition occurs between species when

Which of the following is not a possible effectof increasimg carbon dioxide levels in the atmosphere ?

Scientists are conducting a study on the effectiveness of a new drug on memory loss. they are giving some of the test subjects the new drug to find out if it improves their long-term memory. which are possible limitations of this study? check all that apply. a) test subjects may want to participate in additional experiments. b) test subjects may think they should be paid more. c) test subjects may get bored and want to quit early. d) test subjects may have to travel during the experiment. e) test subjects may have full-time jobs. this is multiple choice. you for the !