Question

Mrs. Lewis set up a lab for her biology students using a culture of the small crustacean Daphnia, obtained from a pond that was 20°C. The students are to investigate the effect temperature has on Daphnia. The students will observe the crustacean’s heartbeat under the microscope, at different temperatures, and count the number of heartbeats per sec. What is the independent variable in this experiment?

5 points

Answer 1

mr lewis planted 121x13 then esmiate the answer in 2 diff ways

Step-by-step explanation:

Answer 2

Hiii, the answer is b, hope this helped! :)

Step-by-step explanation: