Lucy wants to get in shape for the dance next spring and she has calculated her target heartbeat at 141 - 176 beats per minute lately when she plays tennis her heart rate reaches 130 beats per minute which of the following could she do to get a greater benefit during tennis

There is many things she could do why'll playing tennis to get a better benefit from the workout. For example before she plays take 3 laps around the tennis court. Or why'll she is mid play she can run in place to keep her heart rate up why'll waiting for the tennis ball to come back to her.

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