Laura researched and designed a training program to her increase her cardiovascular fitness. unfortunately, after three months, she has still made no progress in her goals. what is the best thing for laura to do next?

Never give up keep trying. Also incase you don't know this noone will see results right off the bat.

Bmust be the answer, as technically all organs move, so a is incorrect. all organs are made of different types of cells, so that isn’t a problem, so c is also incorrect. human hearts are very similar to many other animals’ hearts, so d is also incorrect, yet the heart is made of muscle, which is hard to grow in the lab so it would be correct to say b